Headaches and migraines are common conditions that significantly impact quality of life worldwide. Adequate hydration is increasingly recognised as an important factor in managing these disorders. While dehydration is frequently reported as a trigger for migraines, the scientific evidence remains mixed, with some studies showing improvements in symptoms and quality of life, but limited effects on headache frequency.
This article reviews the current research on hydration’s role in headache and migraine prevention, including key clinical trials and ongoing debates. It aims to provide a clear understanding of whether increasing water intake can be an effective component of migraine management and highlights areas where further research is needed.
Table of contents
The role of hydration in headache and migraine prevention
Headache disorders constitute a considerable global health burden, with migraine recognised as a primary contributor to disability worldwide [1]. Lifestyle adjustments, such as maintaining adequate hydration, are increasingly recognised as crucial components of the comprehensive management of migraines [1]. Water is an essential nutrient, and its broad significance for overall health has garnered increased attention. However, substantial gaps remain in understanding its impact on population-level health outcomes [2].
While prior research suggested a beneficial association between increased water intake and headache relief, there was a notable absence of rigorous randomised controlled trials specifically designed to investigate this relationship, indicating a significant gap in the existing literature. This underscored the need for further systematic investigation into the role of hydration.
This analysis synthesises findings from pivotal studies, including a randomised controlled trial by Spigt et al., to provide a comprehensive understanding of the contribution of hydration to headache prevention. Furthermore, it will examine the ongoing discourse and debate surrounding the clinical recommendation to increase water intake for individuals with headaches.
Empirical evidence I: Water deprivation as a migraine trigger
An observational study conducted by Joseph N. Blau identified water deprivation as a novel trigger for migraine attacks, based mainly on patient self-reports [3]. The study surveyed fifty migraine sufferers, asking whether insufficient fluid intake could provoke their migraines. Twenty participants answered “yes,” seven responded with some uncertainty, and twenty-three said “no.” Additionally, at a meeting of the British Migraine Association (UK), 14 out of 45 migraineurs also recognised fluid deprivation as one of their migraine triggers.
Combining these findings, a total of 34 out of 95 migraine sufferers acknowledged that dehydration could provoke their attacks—a trigger that has not been widely recognised by the medical community. This suggests that fluid deprivation should be added to the list of known migraine precipitants.
The study also highlighted the need for further research to understand how dehydration triggers migraines and whether this applies similarly in different climates. This emerging evidence points to hydration as a potentially important factor in migraine prevention.
Empirical evidence II: Randomised controlled trial on increased water intake (Spigt et al., 2012)
Spigt et al. conducted a randomised controlled trial to investigate the effect of increased water intake on headache frequency and severity among primary care patients. Individuals were eligible if they experienced at least two episodes of moderately intense headache or five mildly intense episodes per month, with a total fluid intake of less than 2.5 L/day. Both the intervention and control groups received generalised advice on stress reduction and sleep improvement approaches, while the intervention group additionally increased their daily water intake by 1.5 L.
While the study found a statistically significant improvement of 4.5 points on the Migraine-Specific Quality of Life (MSQOL) questionnaire in the intervention group, and 47% of participants in this group reported significant improvement compared to 25% in the control group, there were no notable changes in the number of days with at least moderate headaches.
Critically evaluating these findings, Dekker et al. raised concerns about the reliance on MSQOL, particularly because the primary outcome of ‘hours with headache’ was negative and was subsequently transformed into ‘days with at least moderate headache’ through an unreported post hoc power calculation. Additional criticisms included the clinical relevance of the MSQOL change falling below validated minimums for migraine, and the use of a migraine-specific questionnaire for general headache types.
In response, Spigt et al. addressed the critiques regarding the interpretation of subjective versus objective outcomes and their use of “intention to treat” analysis. They clarified that “intention to treat” analysis focuses on analysing patients based on their allocated treatment group and does not inherently mandate imputation of missing values, particularly when differential attrition is a possibility. They acknowledged that differential attrition might have influenced their study and emphasised that avoiding imputation, coupled with a transparent discussion of potential biases in the study’s limitations, represents a sound methodological approach.
| Feature | Control Group | Intervention Group (Increased Water Intake) |
| Number of Patients | 50 | 52 |
| Intervention | Standard advice | Standard advice + 1.5 L additional water |
| Primary Outcome(s) | MSQOL, days with at least moderate headache | |
| MSQOL Improvement | – | 4.5 points (statistically significant) |
| Reported Much Improvement | 25% | 47% |
| Days with Moderate Headache | No relevant change | No relevant change |
Broader context and future directions for hydration in headache management
While some individual studies suggested benefits of water intake for migraine prevention, a systematic review of 18 randomised clinical trials indicated that these findings did not reach statistical significance in a pooled analysis [4]. However, the same review highlighted statistically significant health benefits associated with increased water intake, specifically greater weight loss and fewer nephrolithiasis events [4]. This broader context underscores the need for more rigorous and adequately powered clinical trials precisely investigating hydration’s impact on migraine outcomes, moving beyond merely suggestive findings [4].
The current understanding emphasises the critical role of individualised hydration assessment and patient awareness of dehydration as a potential headache trigger for tailoring effective preventative strategies. Future research should prioritise clarifying the specific physiological mechanisms through which hydration status influences headache incidence and severity. Identifying subgroups of patients most likely to benefit from increased water intake is also crucial, alongside developing personalised hydration recommendations. These recommendations should ideally be based on objective biomarkers and patient-specific triggers [5]. Such targeted research would help overcome existing limitations in the evidence base, paving the way for more definitive and widespread clinical recommendations regarding water intake for headache prevention.
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