An imbalance of fluid and electrolytes in the body can result in a dehydration headache. When your body is dehydrated, your brain may temporarily contract or shrink from fluid loss. This causes the brain to pull away from the skull, causing pain and resulting in a headache.

What does a dehydration headache feel like?

A dehydration headache can feel like a dull headache or an intense migraine headache. Pain from a dehydration headache can occur at the front, back, side, or all over the head. Moving the head may cause more pain.

How do you get rid of a dehydration headache?