Dehydration is caused by a loss or lack of fluids in the body. Severe cases of dehydration can cause seizures, permanent brain damage, and even death. Here are the symptoms of dehydration, how it can be prevented and treated, and when to seek medical attention. For same-day acute dehydration treatment, visit the walk-in clinic at AFC Urgent Care Paramus! Signs and symptoms of severe dehydration Dehydration can be caused by losing fluids due to sweating ...