The Comorbid Relationship Between Migraine and Asthma: A Systematic Review and Meta-Analysis of Population-Based Studies
Long Wang
Zi-Ru Deng1† 
Yu Wang- 1Department of Neurology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
- 2Department of Neurology, The Second People Hospital of Hefei, Hefei, China
Objective: Recent studies have indicated a pathophysiologic link between migraine and asthma. This meta-analysis aimed to comprehensively estimate the risk ratio for migraine in asthma as well as that of asthma in migraine based on available evidence.
Method: We systematically searched the electronic databases including PubMed, Web of Science, and SCOPUS for population-based studies that measured either the odds or the risk of asthma in subjects with migraine as well as that of migraine in subjects with asthma. The titles and abstracts were screened by two independent reviewers to identify eligible studies, and this was followed by full-text review of the included studies. Newcastle–Ottawa Scale (NOS) was used to assess the risk of bias of included literature. A meta-analysis was conducted with Review Manager 5.3 Software to calculate the odds ratio (OR) for case-control and cross-sectional studies and either relative ratio (RR) or hazard ratio (HR) for cohort studies, and the source of heterogeneity was assessed. Subgroup and sensitivity analyses were conducted, and the I2 test were used to assess the source of heterogeneity. The funnel plot, Galbraith plot, and Egger's test were used to evaluate publication bias.
Results: Fifteen published studies covering a total of 1,188,780 individuals were identified. Pooled analysis indicated that migraine was associated with increased odds (OR = 1.54; 95% CI: 1.34~1.77) and risk for asthma (HR = 1.42; 95% CI: 1.26~1.60), and asthma associated with increased odds (OR = 1.45; 95% CI: 1.22~1.72) and risk for migraine (HR = 1.47; 95% CI: 1.41~1.52).
Conclusion: Migraine is a potential risk indicator for asthma, and vice versa, asthma is a potential risk indicator for migraine. However, future prospective cohort studies are warranted to provide more evidence concerning the detailed association between migraine and asthma.
Key Messages
This is the first meta-analysis of population-based studies that assessed the comorbid relationship between migraine and asthma. Migraine is a potential risk indicator for asthma, and vice versa, asthma is a potential risk indicator for migraine.
Introduction
Asthma is a common airway disorder with clusters of respiratory symptoms including recurrent episodes of coughing, shortness of breath, and dyspnea (1). Epidemiological investigation revealed that the incidence of asthma varies widely among different countries ranging from ~7 to 18% (2). Although its condition can be alleviated by inhaled corticosteroid (ICS) or by combined treatment with ICS and long-acting β-agonists (LABA) (3), there is no specific drug that can permanently prevent the recurrence of an asthma attack. Thus, the current goal of asthma management is to focus on managing rather than curing the disease (4). In recent years, increasing attention has been paid to the comorbid conditions of asthma (5–8), which cause a significant burden on families and health care systems (9).
Migraine is a common chronic neurological disorder characterized by multiple symptoms of headache, nausea, vomiting, and/or aura. Research data from Global Burden of Disease (GBD) have shown that as many as 1.04 billion people suffered from migraine globally (10), and its comorbidities contribute to the overall burden of migraine and further lower quality of life (11).
Migraine is frequently comorbid with asthma, and this condition has been recognized as “acephalic migraine” and “pulmonary migraine” (12–14). The common pathophysiologic mechanisms of inflammation and immune dysfunction between the two diseases could explain the bidirectional association. For example, atopy, various inflammatory mediators, or elevated neuropeptide mediators contribute to both migraine and asthma (15). In addition, the shared triggering and environmental factors such as air pollutants are related to the occurrence or aggravation of asthma and the rate of emergency department visits for migraine (16, 17). Moreover, emotional stress or psychological distress, such as anxiety or depression, due to asthma could increase an organism's susceptibility to migraine and vice versa (18).
Whereas, the exact bidirectional association between the two diseases was still unclear through genetic interaction, shared environmental triggering factors have been reported among migraine and asthma. A fundamental step in exploring the association between asthma and migraine is to understand the strength of the comorbid relationship between the two diseases. Therefore, we conducted a systematic review and meta-analysis of population-based evidence to determine the risk of asthma associated with migraine and vice versa.
Methods
Our meta-analysis was conducted on the basis of the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines (19).
Search Strategy
Two investigators (Long Wang and Zi-Ru Deng) independently searched published articles indexed in PubMed, Web of Science, and SCOPUS database until March 2020. Text words and Medical Subject Headings (MESH) terms used were (headache OR migraine) AND (asthma) NOT (“case report” OR review OR “meta-analysis”).
Study Selection
We included population-based studies that met the following inclusion criteria: (1) studies with design being population-based cohort, case-control, cross-sectional literatures; (2) the exposed group consisted of individuals with migraine or asthma, and the control group consisted of people without migraine or asthma; (3) the outcomes used were odds ratio (OR), relative risk (RR), or hazard ratio (HR) to assess the comorbid relationship between migraine and asthma. Studies were not limited by language of publication. If more than one article reported data derived from one cohort or one health database, only the longest follow-up and more comprehensive study was included. We excluded cases series, letters without original data, duplicate studies, and reviews as they did not satisfy the eligibility criteria.
Data Extraction and Quality Assessment
One reviewer extracted the data using a standardized data collection form, and the findings were checked by another reviewer. The following pieces of information were extracted from the included studies: surname of the first author, year of publication, country of study, study design, study subjects, age of patients with migraine or asthma, diagnostic criteria, years of follow-up, outcome, and adjustment. The Newcastle–Ottawa Scale (NOS) was used to assess the quality of the studies (20). For case-control and cross-sectional studies, we assessed the following three domains: (1) selection of the studies: adequacy of the case definition, representativeness of the cases, definition of the controls, and selection of the controls; (2) comparability: comparability of cases and controls based on the design or analysis; (3) exposure: ascertainment of exposure, same method of ascertainment of cases and controls, and non-response rate. The domains evaluated for cohort studies included: (1) selection of the studies: representativeness of the exposed cohort, selection of the control cohort, ascertainment of exposure, and demonstration that outcome was not present at the beginning of the study; (2) comparability: comparability of exposure and non-exposure cohorts; (3) outcome: evaluation of outcome, adequate length of follow-up, and adequacy of follow-up cohorts. A study would be rated as uncertain, low, or high risk based on its effects on validity for each domain.
Data Synthesis and Analysis
Data analysis was performed using Review Manager 5.3 Software. The random-effects model for meta-analysis was conducted to pool the OR of migraine in asthma as well as OR of asthma in migraine. We extracted the adjusted HR and 95% CI from cohort studies to assess the comorbid relationship between migraine and asthma. I2 was calculated to quantify the heterogeneity among the included studies. A value of I2 of 0–25% represents absence of heterogeneity; 25% ≤ I2 < 50%, low heterogeneity; 50% ≤ I2 < 75%, moderate heterogeneity; I2 ≥ 75%, substantial heterogeneity (21). Subgroup and sensitivity analyses were conducted to check potential sources of bias among studies. The funnel plot, Galbraith plot, and Egger's test were used to evaluate publication bias.
Results
Characteristics of Included Studies
As illustrated in Figure 1, we retrieve a total of 15 studies from the database search after removing duplicates. Eventually, 14 articles were included in our meta-analysis, one of which described two separate studies, resulting in a total of 15 studies, which comprised a total of 1,188,780 subjects. The 2019 article by Kim et al. (22) reported two cohort studies (both migraine and asthma exposure).
Figure 1. Flowchart of study identification for meta-analysis.
The characteristics of the included studies are shown in Table 1. Of 15 studies, there were a total of three case-control, six cross-sectional, and six cohort studies. Of these articles included in the final meta-analysis, one is from the United Kingdom (23), three from the USA (11, 24, 25), two from Korea (18), four from China (9, 26–28), one from Denmark (29), one from Norway (30), one from Israel (31), and two from Sweden (32, 33). Majority of studies examined adults, while three examined primarily children or adolescents. Five studies relied upon questionnaire or medical records to identify cases of migraine and/or asthma, while nine relied upon validated International Classification of Headache Disorders (ICHD) or International Classification of Diseases (ICD) codes (34, 35).
Table 1. The characteristics of the included population-based studies in this meta-analysis.
Quality of Included Studies
NOS was used to assess the quality of the included studies. Of 15 studies included in the meta-analysis, 10 studies were of high quality (NOS score >8); five studies were of moderate quality (NOS score between 6 and 7) (See Supplementary Material 1).
Risk of Bias Assessment
The risk of bias assessment for included studies is illustrated in Figures 2, 3. A number of the case-control or cross-sectional studies were rated as “uncertain risk of bias” for the different domain attributing to lack of description on confirmation of the corresponding content. Additionally, the 2020 study by Buse et al. (11) was rated as “high risk of bias” in comparability because age, sex, and ethnicity were unmatched in case group and control group.
Figure 2. (A) Risk of bias of included case-control and cross-sectional studies. (B) Risk of bias of included cohort studies.
Figure 3. (A) Risk of bias of included cross-sectional studies. (B) Risk of bias of included cohort studies.
Odds of Asthma Among Migraine in Case-Control and Cross-Sectional Studies
A total of seven studies, including three case-control studies and four cross-sectional studies with 495,229 migraine patients and control provided data for this outcome. As illustrated in Figure 4A, substantial heterogeneity was found (I2 = 93%). Migraine was associated with a significant increase of prevalent asthma (pooled OR: 1.54; 95% CI: 1.34~1.77).
Figure 4. (A) Odds of asthma in patients with migraine in cross-sectional and case-control studies. (B) Risk of asthma in patients with migraine in cohort studies.
Migraine and Risk of Asthma in Cohort Studies
Four cohort studies with a total of 221,924 migraine patients and control provided data for this outcome. As illustrated in Figure 4B, substantial heterogeneity was found (I2 = 63%). People with asthma had a significantly increased risk for migraine (pooled RR: 1.42; 95% CI: 1.26~1.60).
Odds of Migraine Among Patients With Asthma in Case-Control and Cross-Sectional Studies
Two cross-sectional studies with a total of 116,711 asthma patients and control provided data for this outcome. As illustrated in Figure 5A, migraine was associated with a significant increase of prevalent asthma (pooled OR: 1.45; 95% CI: 1.22~1.72).
Figure 5. (A) Odds of migraine in patients with asthma in cross-sectional and case-control studies. (B) Risk of migraine in patients with asthma in cohort studies.
Asthma and Risk of Migraine in Cohort Studies
Two cohort studies with a total of 354,916 asthma patients and control provided data for this outcome. As illustrated in Figure 5B, people with asthma had a significantly increased risk for migraine (pooled HR: 1.47; 95% CI: 1.41~1.52).
Subgroup and Sensitivity Analyses
In the subgroup analysis for the OR of asthma in patients with migraine, studies were stratified by sample size, age, and location (Table 2). Heterogeneity was relatively lower both in the subgroups of sample size <50,000 (I2 = 42%) and adolescent (I2 = 53%). However, the heterogeneity was significant for both studies that assessed the OR in European (I2 = 98%) and Asian (I2 = 90%).
Table 2. Subgroup analysis for the odd ratio of asthma in patients with migraine.
Moreover, we performed a leave-one-out sensitivity analysis to further explore the data heterogeneity; thus, none of the single studies significantly affected the pooled-effect size (Figure 6).
Figure 6. Plot of sensitivity analysis by excluding one study each time and the pooling estimate for the rest of the studies.
Publication Bias
For the overall meta-analysis of the relative risk of asthma among people with migraine, a visual inspection of the funnel plot (Figure 7), Galbraith plot (Figure 8), and Egger's tests also revealed no potential publication bias (Figure 7A, P = 0.476; Figure 7B, P = 0.531).
Figure 7. (A) Funnel plot for the association between migraine and risk of asthma in cross-sectional and case-control studies. (B) Funnel plot for the association between migraine and risk of asthma in cohort studies.
Figure 8. Galbraith plot for the association between migraine and risk of asthma.
Discussion
In this meta-analysis of population-based studies, we compiled current evidence on the association between migraine and asthma. We found that migraine was associated with 54% increased prevalence and 42% greater risk of asthma, and vice versa, asthma associated with 45% increased prevalence and 47% greater risk of migraine.
One previous review investigated the relationship between migraine and asthma with only two cohort studies and six case-control/cross-sectional studies, and respective risks of developing migraine or asthma were not analyzed based on the findings (36). By contrast, in the current analysis, we included and added more recent studies including three cohort studies, two case-control/cross-sectional studies, and two population-based studies that were left out, then separately analyzed data depending on the type of study design, thus providing robust evidence on the bidirectional association between migraine and asthma.
The exact pathway leading to comorbidity of migraine and asthma remains unclear. Previous studies have demonstrated an insight into the relationship between migraine and asthma from shared inflammatory, immune, and genetic factors (37–39). First, the bidirectional association between migraine and asthma is considered to be attributed to the common pathophysiological process of inflammation and immune dysfunction (39). Studies have shown that allergic responses triggered by allergens, such as pollen, specific grass, release various inflammatory mediators or elevated neuropeptide mediated by mast cells, leading to hypersensitivity of airway responses in patients with asthma (40). In migraine, mast cells in the dura matter activated by allergens may secrete pro-inflammatory and vasodilatory molecules, which are presumed to cause the activation of the trigeminal pain pathway underlying migraine pathogenesis (41, 42). In addition, parasympathetic hyperactivity is believed to be involved in the connection between asthma and migraine (43). An increased cholinergic tone has been suggested to trigger bronchospasm in asthma (44). Acetylcholine released by parasympathetic afferents can directly activate trigeminal pain pathway or provoke the degranulation of mast cell in meninges among migraine (45). Furthermore, transient receptor potential vanilloid subfamily member 1 (TRPV1) expressed in membranes of sensory afferent fibers has been shown to play a key role in the pathophysiology of both migraine and asthma (46, 47). TRPV1 expressed on the trigeminal nociceptors can be activated by various chemical substances, acid, and heat, which results in the release of various neuropeptides that cause neurogenic inflammation and exert a vasodilatory effect, both of which are crucial factors in the generation of migraine (47, 48). Similarly, TRPV1 expressed in airway C-fiber afferent neurons can be activated by endogenous activators or inhaled irritants, which has been observed in asthma patients (49, 50).
For the subgroup analysis, it is indicated that the source of heterogeneity may be due to the sample size and age. Therefore, more studies with large samples and different age groups are needed to clarify the bidirectional relationship between the two diseases.
To our knowledge, this is the first meta-analysis of population-based studies that assessed the comorbid relationship between migraine and asthma. Nevertheless, this meta-analysis has the following limitations. It is difficult to verify the causal relationship between migraine and asthma because there are only four and two cohort studies in the corresponding subgroup, respectively. In addition, as previously mentioned, though migraine and asthma may share a pathogenesis process, it is difficult to confirm whether there is a direct relationship between the two diseases. Moreover, only one case-control study was primarily of adolescents and five of six cohort studies were carried out in Asia, potentially limiting the generalizability of our findings to region and population. Even so, our findings are still of important implications. The bidirectional relationship we found might aid in preventing or identifying people with these two diseases. It is necessary to get further information about potential overlapping pathways in pathogenesis, which may facilitate the development of new treatment strategies for migraine and asthma.
Conclusions
We found that migraine is a potential risk indicator for asthma, and vice versa, asthma is also a potential risk indicator for migraine. To further examine this finding and establish a more robust result, more large-scale prospective cohort studies are warranted to provide more evidence concerning the detailed association between migraine and asthma.
Data Availability Statement
The original contributions generated for this study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author/s.
Author Contributions
LW and Z-RD contributed to the data curation. LW contributed to the formal analysis, funding acquisition, and writing of the original draft. LW, JZ, and M-DZ contributed to the investigation, methodology, resources, and validation. Z-RD and YW contributed to the project administration. LW, Z-RD, and M-DZ acquired the software. LW and JZ contributed to the supervision and writing, review, and editing. All authors contributed to the article and approved the submitted version.
Funding
This work was supported by Natural Science grants to Yu Wang (Grant number: 81671290) from the National Natural Science Foundation of China.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Supplementary Material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fmed.2020.609528/full#supplementary-material
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Keywords: comorbid, migraine, asthma, risk, meta-analysis
Citation: Wang L, Deng Z-R, Zu M-D, Zhang J and Wang Y (2021) The Comorbid Relationship Between Migraine and Asthma: A Systematic Review and Meta-Analysis of Population-Based Studies. Front. Med. 7:609528. doi: 10.3389/fmed.2020.609528
Received: 23 September 2020; Accepted: 25 November 2020;
Published: 13 January 2021.
Edited by:
Arcangelo Barbonetti, University of L'Aquila, ItalyReviewed by:
Settimio D'Andrea, University of L'Aquila, ItalyDeena Kuruvilla, Yale University, United States
Copyright © 2021 Wang, Deng, Zu, Zhang and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Yu Wang, yw4d@hotmail.com
†These authors have contributed equally to this work