Caffeine is a vasoconstrictor — it narrows swollen blood vessels in the brain, which is why it's a key ingredient in medications like Excedrin. However, when caffeine leaves your system, those vessels can "rebound" and swell even larger than before.
The worst thing you can do is have 4 cups of coffee on Monday and zero on Tuesday. This caffeine withdrawal is one of the most reliable migraine triggers. If you use caffeine, maintain a strict, identical dosage every single day — including weekends.
The Relief app correlates your attacks with weather, sleep, food, and more — automatically.
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