What are signs of dehydration?

See below: Feeling weak, lightheaded, fatigue, thirsty, dry mouth.

See below: Low bp, weak, dry mouth and skin, dizziness on standing up.

Thirst most common: Depending on the degree of dehydration, the first signs are generally feeling thirsty. If dehydration progresses, then signs of dizziness and abdominal cramping can occur. Severe dehydration can cause shock which would call arms and legs to get cool and look blue in color Urination stops during moderate and severe dehydration and mouth becomes dry and the body cannot make tears