There are many signs and symptoms that may indicate dehydration. They include:   ● Confusion. ● Dark yellow pee ● Dry mouth. ● Dry skin. ● Fainting ● Feeling dizzy. ● Having a mouth that feels tacky/sticky. ● Headache. ● Irritability. ● Lack of energy. ● Muscle cramps. ● Rapid breathing. ● Rapid heartbeat. ● Sleepiness. ● Sunken eyes. ● Thirst. ● Very infrequent urination.   In babies and children, symptoms may also include:   ● A diaper that’s been dry for 3+ hours. ● Dry mouth and tongue. ● No tears when crying. ● Restlessness and/or irritability. ● Sleepiness. ● Soft spot at the top of the skull. ● Sunken eyes and cheeks.   While mild dehydration can be treated at home by cooling off and replenishing fluids, severe dehydration is considered to be a medical emergency and requires immediate treatment.