Severe dehydration can cause:

• Extreme thirst
• Extreme fussiness or sleepiness in infants and children; irritability and confusion in adults
• Very dry mouth, and skin
• Little or no urination
• Sunken eyes
• Shriveled and dry skin that lacks elasticity and doesn’t “bounce back” when pinched into a fold
• In infants, sunken fontanels — the soft spots on the top of a baby’s head
• Low blood pressure
• Rapid heartbeat
• Rapid breathing
• No tears when crying
• Fever
• In the most serious cases, delirium or unconsciousness