Your body is roughly 60% water, but that number shifts with age, sex, and body composition. Here's what all that water does and how to maintain the right balance.
A sudden seizure can stem from low blood sugar, withdrawal, stroke, infection, or even poor sleep. Here's what doctors look for and what it means for you.
Waking up with a headache could point to dehydration, sleep apnea, teeth grinding, or caffeine withdrawal. Here's how to figure out what's causing yours.