Here’s what happens to your body when you drink water on an empty stomach.

drinking enough fluid, water may help.

But headaches

have many possible causes, including:

* poor sleep
* migraine
* stress
* caffeine withdrawal
* high blood pressure
* illness

Persistent or severe headaches should not automatically be blamed on dehydration.

## 7. It Can Help Replace Fluids Lost Overnight

People who sleep in hot environments, sweat heavily, or breathe through the mouth may wake up feeling particularly dry.

Morning  water can help with symptoms such as:

* dry mouth
* thirst
* sticky saliva
* mild dizziness

Again, the main benefit is rehydration—not detoxification.

## 8. It