- Review article
- Open Access
The association between headache and low back pain: a systematic review
The Journal of Headache and Pain volume 20, Article number: 82 (2019)
To systematically review studies quantifying the association between primary chronic headaches and persistent low back pain (LBP).
We searched five electronic databases. We included case-control, cross-sectional and cohort studies that included a headache and back pain free group, reporting on any association between persistent LBP and primary headache disorders. Methodological quality was assessed using Newcastle-Ottawa Scale. Our primary outcome was the association between primary headache disorders and persistent LBP. Our secondary outcomes were any associations between severity of LBP and severity of headache, and the relationship between specific headache sub-types classified as per International Classification of Headache Disorders (ICHD) criteria and persistent LBP.
We included 14 studies. The sizes of the studies ranged from 88 participants to a large international study with 404, 206 participants. Odds ratios for the association were between 1.55 (95% confidence interval (CI) 1.13–2.11) and 8.00 (95% CI 5.3–12.1). Study heterogeneity meant statistical pooling was not possible. Only two studies presented data investigating persistent LBP and chronic headache disorders in accordance with ICDH criteria.
We identified a positive association between persistent LBP and primary headache disorders. The quality of the review findings is limited by diversity of populations, study designs and uncertainly about headache and LBP definitions.
PROSPERO 2018 CRD42018086557.
Low back pain and headache are leading causes of disability worldwide [1, 2]. Each headache disorder has specific diagnostic criteria . The commonest types of headache are migraine, tension-type (both primary headaches) and medication overuse headache (a secondary headache) . Migraine and tension-type headache featured in two of the eight causes of chronic disease and injury, each affecting more than 10% of the world’s population . Chronic headache is a severely disabling condition affecting around 3–4% of adults worldwide . It is defined as a headache occurring on ≥15 days per month for more than 3 months .
Low back pain has a high healthcare burden, and in the most recent global burden of disease study, both low back pain and migraine were featured in the five leading causes of years lived with disability . Around 4% of the UK population take time off work because of low back pain, resulting in around 90 million working days lost and between 8 and 12 million General Practitioner (GP) consultations per year . Chronic low back pain is defined as pain felt in the area between the bottom of the rib cage and the buttock creases for more than 3 months .
There is a considerable focus in headache management in achieving a precise diagnosis in line with the International Classification of Headache Disorders . Once a diagnosis is identified, management is focused accordingly [3, 8]. In contrast once serious causes of low back pain are excluded (malignancy, vertebral fractures, inflammatory disorders or infection) non-specific low back pain is diagnosed.2, 3,
People with persistent low back pain and people with chronic headache disorders are typically managed by clinicians from specific clinical specialities rather than experts in the management of chronic pain syndromes . Whilst this approach may be appropriate for those living with one of these chronic conditions, it may be different if people have both. A previous systematic review of twin studies has identified a possible independent association between headache and low back pain . People with both headache disorders and low back pain might constitute a neglected group that could have both conditions managed in combination rather than as separate entities. Here, we describe a systematic review of observational studies reporting the association between headaches (primary headaches, and chronic headaches) and persistent low back pain.
We sought to identify all case control, cohort and cross-sectional studies reporting the relationship between primary headache disorders and persistent low back pain. We used a wide definition of headache disorders to reflect that exact headache type is often poorly defined and setting tight diagnostic criteria for study inclusion would exclude much of the available literature. Here, we use the term persistent to define low back pain duration rather than the term chronic . This reflects that duration of low back pain is often poorly defined and using a strict definition for chronicity of back pain would exclude much of the available literature. For this review, we have reported the definitions of headache and low back pain used by the original authors of the included studies. This will allow the reader to interpret the findings cognisant of the definitions used.
The protocol for the review is registered on PROSPERO (PROSPERO 2018 CRD42018086557). This can be accessed via this link: http://www.crd.york.ac.uk/PROSPERO/display_record.php?ID=CRD42018086557.
One reviewer (AV), with the assistance of an academic librarian, searched five electronic databases: Medline, Embase, Applied Social Sciences Index and Abstracts (ASSIA), PsychINFO and Web of Knowledge. These searches were supplemented by forward and backward citation tracking from included studies and relevant review papers. We excluded dissertations and conference proceedings. The electronic search terms included Medical Subject Headings (MeSH) headings, text words and truncation. Full details of the Medline search (as an exemplar) are available in online Appendix. Searches were run on 05/01/2018. A second search was run on 06/07/2018 to ensure recently published articles were included. The PRISMA 2009 checklist was used to ensure methodological quality . The protocol for this systematic review was published on PROSPERO (registration number CRD42018086557).
The association between chronic headache disorders and persistent low back pain.
The relationship between severity of headache and low back pain.
The relationship between specific headache sub-types classified as per ICHD criteria and persistent low back pain .
We included any cross-sectional, cohort or case-control study, published in English. We sought to include studies reporting on the presence of headache, primary headache disorder, or medication overuse headache, with persistent low back pain with or without radicular pain. We had no restriction on age of participants. Studies were excluded if they did not compare participants to a control group ‘no headache or no back pain groups’.
After removal of duplicates, two reviewers (AV and CE) screened all abstracts and titles against the eligibility criteria using Covidence systematic review software (Veritas Health Innovation, Melbourne, Australia). Full texts of potential studies were then screened by the same reviewers. A further reviewer (MU) arbitrate any disagreement and agreed the final eligible studies.
Two reviewers (AV and CE) independently assessed the methodological quality of each study using the Newcastle-Ottawa Quality Assessment Scale (for cohort and adapted for cross-sectional studies) , MU adjudicated disagreements. Studies were not excluded on the basis of quality. The Newcastle-Ottawa Assessment of bias measures quality according to a star-based system; there is separate scoring system for cohort and cross-sectional studies. Each study is judged on three categories, selection of study groups, comparability of groups, and the ascertainment of either the exposure of interest in case-control studies or outcome of interest in cohort studies. Good quality studies receive a minimum of six stars . Authors’ conflicts of interests were noted.
The data on the association between headache and persistent low back pain were extracted independently by two reviewers (AV and CE) and then compared for the final data extraction table which was checked by a statistical reviewer HP. We extracted the descriptions of headache and back pain phenotypes as reported by the original authors. Where appropriate original authors were contacted for clarification. Due to study heterogeneity, statistical pooling was not appropriate. We therefore used a narrative synthesis approach. We extracted odds ratios from papers that reported the presence or absence of headache with the presence or absence of persistent low back pain. Some papers presented odds ratios from a variety of different statistical models; in these cases, we chose the odds ratio from the multivariate adjusted model. In other cases, we calculated or corrected odds ratios from the data presented within the paper. Results presented are from published data only.
We identified 5538 potentially relevant citations, which included 4410 unique citations, 4364 of which did not meet inclusion criteria. Overall, we identified 46 studies that warranted scrutiny of the full text, 15 of these were included in the review. Thirty-one studies were excluded because they did not include a headache and back pain free group, or did not report on any association between low back pain and headaches. We included 15 papers reporting on 14 studies (Fig. 1). Citation tracking did not yield any additional result.
Studies were heterogeneous, but a consistent positive association between headache and low back pain was found. This is consistent across countries, populations and study design but variable in magnitude. The odds ratios range from OR 1.72 (95% CI 1.38–2.15) [15, 16] to 8 (95% CI 5.3–12.1) .
Four studies were of children/adolescents (one cohort , three cross-sectional [18,19,20],) ten were adult studies (one cohort , four cross-sectional [10, 22,23,24], one cross-sectional older adult study , one cohort twin study , three cross-sectional twin studies) [15, 16, 27, 28] (Table 1).
Studies came from; Denmark (four studies) [15, 16, 22, 26, 27], USA (2 studies) [18, 28], and one each from Germany , Iran , Norway , Switzerland , Tunisia , UK , and Qatar . One large multinational study included participants from 29 countries from Europe, North America and Israel [20, 28].
Study size ranged from 88 participants  to a large international study with 404,206 participants . Three studies had 8,000–10,000 participants. Overall, we include data on studies with 460,195 participants. Ages ranged from 9.8 years  to 102 years [15, 16] (Table 1).
Methodological quality assessment
All three cohort studies received seven stars or above [17, 21, 26]. Six cross-sectional studies were of good quality receiving seven stars or above [10, 15, 16, 18,19,20, 22, 24] (Table 2).
For each included study, details of study funding source and study authors’ conflicts of interests can be found in Additional file 1. Furthermore, the characteristics of excluded studies (for including the wrong outcome) can be found in Additional file 2.
Definitions of headache and back pain
Definitions of low back pain varied. Due to the nature of observational studies low back pain was self-reported but the detail asked of participants, and described by studies was variable (Table 1). Swain et al. , used a five point scale to report low back pain frequently in the past 6 months. Hartvigsen et al. [15, 16], asked several specific questions regarding low back pain (‘have you during the past month suffered from back pain, acute low back pain or lumbago?’) Few studies measured self-reported back pain with established questionnaires. Hestbaek et al. 2006 , measured low back pain with a Nordic questionnaire as did Sjolie et al. ,. Bener et al. , used a variety of outcome measures including the Roland-Morris Disability Questionnaire , a widely used health status measure for low back pain. Jones et al. , provided an illustration of a shaded area of the lower back participants where participants may have expected to experience low back pain in the past month. Angst et al. , distinguished between lumbar back pain versus cervical pain .
Persistency of low back pain was described infrequently. Chronic low back pain was defined by pain in the low part of the back and thigh pain radiating to above the knee lasting over 3 months by Bejia et al.  Hestbaek et al. 2006 , defined persistent low back pain being longer than 30 days in the past year, Yoon et al. asked for self-reported low back pain more than 15 days per month . Ashina measured low back pain by self-reported frequency in the last year .
Like low back pain, there were varying definitions of headache, and chronic headache. Only the two studies by Ashina et al. , and Yoon et al.  used the ICHD (2nd edition) , now superseded by a third edition . Yoon et al. also used a validated headache-screening questionnaire [10, 31]. Six studies specified that migraine or headache was self-reported [15, 16, 18,19,20, 23, 25]. Bener et al. , and Jones et al. , provided no definition, and Angst et al.  reported on participants reporting migraine or headache.
Hestbaek et al. , analysed participants according to any positive answers to headache regardless of aetiology (migraine, headache with nausea, headache with photophobia/phonophobia, severe ocular pain). Schur et al.  asked if participants had a doctor’s diagnosis of headache, the authors here also explained why they used a self-reported method rather than diagnostic criteria, as validated measures were too lengthy and diagnostic criteria were not agreed upon. Hartvigsen et al. [15, 16] asked participants in a survey whether a physician had ever told them they suffered from various diseases (outcome reported as migraine headache in results), answers were taken as valid if participants confirmed that a diagnosis was made by a physician. Therefore, whether participants are truly reporting migraine or another type of headache is unclear [15, 16].
Three studies involved face-to-face interviews within the sample. Ahangar et al.  used a mixture of questionnaires and in-person interviews to collect data from elderly people in the town of Amirkola, Iran. Bener et al.  used trained nurses to interview patients and complete questionnaires. Angst et al.  used a stratified subsamples of the original sample for face-to-face interviews, two-thirds of those participants scoring high risk for psychopathological syndromes according to the Symptom Checklist-90-R .
No studies reported on the severity of headache and severity of low back pain.
Relationship between specific headache types and persistent low back pain
Table 3 summarises the results of the included studies. Ashina et al.  found 649/796 (81.5% of their participants had lifetime prevalence of low back pain); 321/796 (40.3%) of their participants had primary headache (migraine and/or frequent episodic tension type headache or chronic tension type headache). Of these 475/796 (59.7%) reported infrequent episodic tension type headache or no headache categorised as no headache in the past year; 281/796 (35.3%) had episodic headache, 80/796 (10.1%) had pure migraine, 138/796 (17.3% had pure tension type headache, and 103/796 (12.9%) had coexistent migraine and tension-type headache. No case of chronic migraine was identified in the study. Ashina et al.  noted a positive correlation between the number of days with tension type headache or migraine and number of days with low back pain in the past year (r = 0.25, p < 0.001, r = 0.16, p < 0.001, respectively). The lifetime relative frequency of low back pain was higher in those with primary headache migraine and or tension type headache than those without headache (87.2 versus 77.7%) (p = 0.001). The adjusted odds ratio for primary headache (migraine and or frequent tension type headache or chronic tension type headache) and low back pain was OR 1.7 (95% CI 1.2–2.5).
Yoon et al. , identified those affected by chronic low back pain and primary headache disorders. The outcome variable of low back pain was defined as presence of frequent low back pain (yes vs. no), defined as self-reported low back pain occurring on more than or equal to 15 days per month. We present their multivariate analysis results (adjusted for age, gender, smoking status, drinking status, education level, BMI).
The association between migraine and low back pain was OR 1.2 (95% CI 0.7–2.1) (Ashina et al.) , and frequent low back pain and episodic migraine (no coexisting tension-type headache) OR 4.6 (95% CI 4.0–5.4)(Yoon et al) . The association between episodic headache and low back pain was OR 1.7 (95% CI 1.2–2.5) (Ashina et al.)  and frequent low back pain and episodic headache OR 3.8 (95% CI 3.4–4.2) (Yoon et al) . Associations between tension-type headache and low back pain were as follows; pure tension-type headache and low back pain OR 1.9 (95% CI 1.2–3.1) (Ashina et al.)  and episodic tension-type headache OR 3.5 (95% CI 3.0–4.1) (Yoon et al) .
Combining migraine and tension type headache disorders and experience of low back pain
Ashina et al.  found an OR 2.4 (95% CI 1.3–4.4), and Yoon et al.  found an OR 4.8 (95% 4.2–5.5) between frequent low back pain and episodic migraine with coexisting tension-type headache.
Chronic headache and low back pain
Ashina et al.  found 40 individuals that reported chronic headache. In their analysis of chronic headache and low back pain the adjusted odds ratio was 1.9 (95% CI 0.8–4.5). Low back pain was used in analysis if it had been reported occurring at least 1 day in the past year.
Yoon et al. , found an odds ratio of chronic low back pain and chronic headache of 8 (95% CI 5.3–12.1); low back pain and chronic migraine with coexisting tension type headache OR 9.3 (95% CI 5.6–15.5); low back pain with chronic migraine (no coexisting tension type headache) OR 9.5 (95% CI 4.9–18.4); low back pain and chronic tension type headache OR 4.4 (95% CI 2.1–9.0).
In this review, we aimed to identify and describe an association between primary headache disorders and persistent low back pain. These are conditions that generate considerable morbidity globally,1 , but that have not been widely managed as co-morbidities. We have identified 14 studies reporting an association between primary headache disorders and persistent low back pain. Overall, there was a positive association in all studies, with odds ratios estimating the relationship between primary headache and low back pain ranged from 1.55 (95% CI 1.13–2.11) and 8.00 (95% CI 5.3–12.1). This appears to be a consistent finding irrespective of population studied or the study design. Although methodological quality varied, the larger epidemiological studies of Swain and Yoon are likely to illustrate a true population association due to the large population covered [10, 20]. Although, because of the extreme heterogeneity of study designs, definitions and populations studied, we cannot provide a pooled estimate the results indicate that a relationship exists between headache and low back pain. Thus, indicating reasonable grounds for further study.
We have followed the PRISMA guidance for systematic reviews during this review process . The studies we identified had a large range of number of participants, a variety of methodologies, a large variety of countries, represented and participants of all ages. The total sample size represented in this review was 460 435. The review is limited by the varying definitions of chronic headache and low back pain, and in many cases, there was little explanation as to what was taken as a case definition of either headache (chronic or otherwise) or low back pain (Table 1). Some studies reported migraine specifically, but this was self-reported diagnosis, therefore may include non-migrainous headache subtypes [15, 16]. That no studies used current diagnostic or classification criteria of headache constrains the inferences that can be drawn from the existing literature. We looked for the association between chronic headache disorders and persistent low back pain but chronicity was not always determined in the published literature, and where chronicity was clarified the definitions used were variable.
Our review may be susceptible to publication bias. Attempts at eliminating bias in observational studies have been made, including the STROBE guidelines, which provides a checklist for authors of observational studies to use when disseminating data and result . This includes advice on reporting all outcome events or measures, which should therefore include negative results. However, despite a well-designed and a comprehensive search strategy in a systematic review, positive outcomes are more likely to be published than negative outcomes . Since our initial scoping review indicated that data would be sparse we have included all published studies and not set a size or quality criterion to define study inclusion. Data published in languages other than English may also have been missed, however, given the consistency of our findings it is unlikely that any such studies will materially affect our overall conclusions.
We are constrained by the variable approaches to define headache disorders by the original authors. Nevertheless, we identified an important association between chronic headache and persistent low back pain in the two studies that used ICHD diagnostic criteria [3, 30] to define chronic headache and formally differentiate between primary headache disorders. Yoon et al. used ICHD to diagnose the primary headache disorders and chronic headache disorders; they also used our preferred criteria of diagnosing low back pain . Ashina et al. also used ICHD criteria for headache diagnosis.10 , A combined approach to treating both conditions could reduce pill-burden, medication overuse, and provide a holistic treatment approach for two chronic pain syndromes.
A large-scale European study found moderate to severe chronic pain reported in 19% of adults, notably half of these felt their pain was inadequately managed  A number of countries have recognised the therapeutic benefits of less location-specific pain relief in recent evidence-base back pain management guidelines (including cognitive behavioural therapies and mindfulness training) [9, 36, 37]. Treating chronic pain remains a challenge for clinicians and unfortunately unrealistic expectations of short-term pain control can lead to pharmacological over prescription (opioids in particular), and even excess interventions (including surgery or nerve blockade) . Although 90% of patients who consult their general practitioner for low back pain in the UK stop consulting within 3 months, most are still experiencing low back pain and related disability 1 year after consultation . This suggests that either those affected feel that there is limited help available, or that for another reason consultation is not worthwhile .
Understanding chronic pain is complex. There is some evidence suggesting that chronic pain conditions can be exacerbated by changes in psychological processing . A review article surmised that chronic pain can lead to a vicious cycle of progressive changes in psychological well-being which are aggregated by reduced dopaminergic effects, pain sensitisation leading to worsening pain states through anti-reward and stress related neuroadapations . Another low back pain study found that people exhibiting deficits in emotional awareness or difficulties in processing feelings had higher odds of experiencing low back pain . There is also a genetic overlap between migraine and depressive illness .
Recognition of the impact that psychological processing can have on chronic pain has been recognised by the use of non-pharmacological treatments in chronic pain management. Examples include exercise therapy, and psychological therapies such as cognitive behavioural therapy . Behavioural therapies have been endorsed by American Headache society, who describe chronic headache as a biopsychosocial disorder, involving not just physical disease but recognising the potential contribution of psychological processing and stressors to chronic headache symptomology .
In addition to considering psychosocial determinants of chronic pain processing in persistent low back pain and chronic headache, there are possible biological explanations. A previous systematic review on low back pain and other comorbidities has suggested that differences in gene expression could be implicated in the process of pain perception and signalling . Similarly in migraine research, certain genetic mutations have been linked with differences in pain sensation . For example, mutations in NGF (nerve growth factor) causing loss of pain perception, and TRPM8 (transient receptor potential cation channel subfamily M member 8) a receptor-activated non selective cation channel involved in sensing cold and possibly modulating pain sensation . Monoclonal antibodies targeting calcitonin gene- related peptide (CGRP) have also been shown to have some effect in migraine prophylaxis  CGRP has been related to other pain mechanisms, including facet joint pain, which is a recognised cause and contributor to low back pain. A 2017 systematic review on CGRP reported that numerous studies have found an association between measured CGRP levels and pain, concluding that CGRP could be a neuromodulator in pain syndromes other than migraine . Indeed, CGRP fibres have been found in degenerated human intervertebral discs sensory nerve fibres, further suggesting it may a role in nociceptive back-related pain . Therefore, it is biologically plausible that the neuromodulator CGRP is involved in an association between low back pain and migraine. In this review one study in particular, Yoon et al., identified a particularly strong association between migraine and chronic low back pain . This lends some support to the notion that there might be a particular association between migraine and persistent back pain mediated through a specific biological mechanism.
Headache disorders, including migraine, may be associated with chronic painful disorders other than back pain. For example, the prevalence of co-morbid migraine in people with fibromyalgia has ranged from 18% to 36% in different studies . There is a plausible link for this association through the role of central sensitisation in both disorders . We are not aware of any systematic reviews quantifying the strength of the association between fibromyalgia and headache disorders. Further epidemiological work is needed to more fully explore the interrelationship between headache disorders and other painful disorders.
Further study should focus on the prospective and observational study of chronic headache patients and experience of persistent low back pain. In addition, study designs that examine apparent mechanisms that account for an association between persistent low back pain and primary headache disorders, in particular chronic headache would be beneficial. Such studies could lead us closer to finding concomitant management of both pain syndromes.
Low back pain and headache are significant causes of disability worldwide.
People with both low back pain and headache disorders may constitute a neglected patient group that could have both conditions managed in combination, rather than as separate entities.
We identified a positive association between low back pain and headache disorders.
A combined approach to treating both conditions could reduce pill-burden, medication overuse and provide a holistic treatment approach for the two chronic pain syndromes.
Availability of data and materials
The data used and analysed during this review are available from the corresponding author on reasonable request.
Applied Social Sciences Index and Abstracts
Calcitonin Gene-Related Peptide
International Classification of Headache Disorders
Low back pain
Medical Subject Headings
Transient Receptor Potential cation channel subfamily M member 8
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We would like to thank Ms. Samantha Johnson, academic librarian at University of Warwick, for her assistance with the electronic database searches.
Statistical analysis was checked by Dr Helen Parsons (Warwick Clinical Trials Unit, Warwick Medical School, Coventry, UK) with thanks.
The UK Academic Foundation Programme supported AV and CE to undertake this project.
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MU was Chair of the NICE accreditation advisory committee until March 2017 for which he received a fee. He is chief investigator or co-investigator on multiple previous and current research grants from the UK National Institute for Health Research, Arthritis Research UK and is a co-investigator on grants funded by Arthritis Australia and Australian NHMRC. He has received travel expenses for speaking at conferences from the professional organisations hosting the conferences. He is a director and shareholder of Clinvivo Ltd. that provides electronic data collection for health services research. He is part of an academic partnership with Serco Ltd. related to return to work initiatives. He is a co-investigator on a study receiving support in kind from Orthospace Ltd. He is an editor of the NIHR journal series for which he receives a fee.
MSM serves on the advisory board for Allergan, St Jude Medical, Medtronic and Eli Lilly and has received payment for the development of educational presentations from Allergan, St Jude Medical, Medtronic and electroCore.
HP is a co-investigator on a study receiving support in kind from Orthospace Ltd.
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MEDLINE search strategy
The search strategy for MEDLINE is included below.
This was adapted for the other databases.
exp. Migraine Disorders/(28066)
exp. headache disorders, primary/(32171)
exp. Headache Disorders/(35499)
medication overuse.mp. or exp. Prescription Drug Overuse/(1150)
headache.mp. or exp. Headache/(74812)
6 and 7 (942)
exp. Tension-Type Headache/(2081)
1 or 2 or 3 or 4 or 5 or 8 or 9 or 10 (101688)
exp. Back Pain/ or exp. Low Back Pain/(37275)
(back pain or low back pain or backpain or low backpain or back-pain or low back-pain).mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms] (50956)
12 or 13 (51111)
exp. Cohort Studies/or cohort.mp. (2032295)
exp. Case-Control Studies/or case control*.mp. or case-control*.mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms] (1024081)
exp. Epidemiologic Methods/or epidemiol*.mp. (6107794)
(cross section* or cross-section*).mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms] (378101)
15 or 16 or 17 or 18 (6209092)
11 and 14 and 19 (1125)
limit 20 to english language (1015)
Additional file 1:
Conflicts of interests and funding of included studies. (DOCX 15 kb)
Additional file 2:
Characteristics of excluded studies for wrong outcome. (DOCX 18 kb)
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Vivekanantham, A., Edwin, C., Pincus, T. et al. The association between headache and low back pain: a systematic review. J Headache Pain 20, 82 (2019). https://doi.org/10.1186/s10194-019-1031-y
- Primary chronic headaches
- Persistent low back pain
- Chronic pain syndromes