💧 Guide
Water and headaches: how much to drink to stay pain-free
One of the most common and most avoidable causes of a headache is plain dehydration. Even a small water deficit can bring on pain in sensitive people.
How dehydration hurts
When fluids run low, blood volume drops and the electrolyte balance shifts; the brain responds with pain. A "hangover" headache is largely dehydration. The good news: this kind of headache usually eases 30–180 minutes after drinking water.
How much to actually drink
- Roughly 1.5–2.5 L of fluids a day, more in heat and with exercise.
- Not all at once — steadily through the day.
- Coffee and tea count too, but don't replace water.
- A simple gauge: pale urine usually means well hydrated.
How to check if it's a factor for you
Log your headaches and how much you drink. After a few weeks you'll see whether worse days line up with less water. If they do, hydration is one of the simplest "remedies" you have on hand. Note: dehydration rarely acts alone — more often it stacks with sleep, weather or a skipped meal.
See a doctor for frequent headaches. This article is for information only.
Lunaria — the health diary that listens
Note how you feel in a sentence, and Lunaria connects it with weather, pollen and the moon — and reveals patterns.