Can dehydration cause a migraine?

Dehydration is a commonly reported trigger listed by the NHS and The Migraine Trust, but it's an association that varies between people and often acts alongside other triggers. Tracking it is how you find out whether it matters for you.

How much should I drink to avoid attacks?

Temple doesn't set targets — it isn't medical or nutrition advice. It records whether low-fluid days line up with your attacks so you can raise a real pattern with a healthcare professional.

Dehydration and migraine: tracking the association

Not drinking enough is one of the more actionable things people associate with their migraine days, and it often travels with others — a busy day where you also skip meals, sleep badly and forget to drink. Temple can't prove dehydration triggered an attack, but a dated record can show whether low-fluid days and your migraine days tend to line up.

What the evidence says

The NHS lists dehydration among migraine triggers, and it appears on The Migraine Trust's trigger lists too. The association is widely reported and, unlike weather or hormones, it's something within reach — but it rarely acts alone, and it isn't a proven cause for everyone. The honest approach is to record it and see whether it matters for you rather than assuming it does.

How to log it usefully

You don't need to measure millilitres. A rough daily note — well hydrated, or clearly not — beside your migraine days is enough to reveal a pattern over a few months. Because dehydration so often clusters with skipped meals and poor sleep, logging them together helps you see which thread, if any, tends to travel with your attacks.

How Temple surfaces the pattern

Temple keeps your hydration notes next to your dated migraine days and your other trigger notes, so you can see whether attacks follow low-fluid days on their own or only when several triggers stack up. The diary records the association; it doesn't predict attacks or set a hydration target for you.

Temple logs a quick hydration note beside each dated migraine day, so any link between low-fluid days and attacks shows up as a pattern you can review.

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Common questions

Can dehydration cause a migraine?: Dehydration is a commonly reported trigger listed by the NHS and The Migraine Trust, but it's an association that varies between people and often acts alongside other triggers. Tracking it is how you find out whether it matters for you.
How much should I drink to avoid attacks?: Temple doesn't set targets — it isn't medical or nutrition advice. It records whether low-fluid days line up with your attacks so you can raise a real pattern with a healthcare professional.