Dehydration This occurs when there is less fluid in the circulation and body tissues than is needed for proper bodily functions.  This can stem from the loss of body fluids due to sweating or excess urination. Dry mouth Skin tenting (skin loses its recoil ability) Lack of tear production Decreased urine production Confusion Coma Fluid deprivation Inability to drink liquids Prolonged heat exposure Diabetic Ketoacidosis Diabetic hyperosmolar Coma Infections occur especially in the elderly Large Burns (fluid loss through the skin) Overuse of water pills (diuretics) Diarrheal illnesses Prolonged vomiting Orthostatic blood pressure measurements Elevated BUN out of proportion to an elevated Creatinine Central venous pressure measurements if diagnosis unclear Oral electrolyte and mineral fluids Intravenous fluids (Initially, normal saline is usually the most effective)