Dehydration in sick children is often a combination of refusing to eat or drink anything and losing fluid from vomiting, diarrhea, or fever.
Infants and children are more likely to become dehydrated than adults because they weigh less and their bodies turn over water and electrolytes more quickly. The elderly and people with illnesses are also at higher risk.
Other tests may be done to determine the cause of the dehydration (for example, blood sugar level to check for diabetes).
Drinking fluids is usually enough for mild dehydration. It is better to drink small amounts of fluid often (using a teaspoon or syringe for an infant or child), instead of trying to force large amounts of fluid at one time. Drinking too much fluid at once can bring on more vomiting.
Electrolyte solutions or freezer pops are very effective. These are available at pharmacies. Sports drinks contain a lot of sugar and can cause or worsen diarrhea. In infants and children, avoid using water as the primary replacement fluid.
Intravenous fluids and a hospital stay may be needed for moderate to severe dehydration. The health care provider will try to identify and then treat the cause of the dehydration.
Call 911 if you or your child have the following symptoms:
Call your health care provider right away if you or your child has any of the following symptoms:
Blood in the stool or vomit
Diarrhea or vomiting (in infants less than 2 months old)
Dry mouth or dry eyes
Dry skin that sags back into position slowly when pinched up into a fold
Listlessness and inactiveness
Little or no urine output for 8 hours
Sunken soft spot on the top of your infant's head
Call your health care provider if you are not sure whether you are giving your child enough fluids.
Also call your health care provider if:
You or your child cannot keep down fluids during an illness
Vomiting has been going on for longer than 24 hours in an adult or longer than 12 hours in a child
Diarrhea has lasted longer than 5 days in an adult or child
Your infant or child is much less active than usual or is irritable
You or your child is urinating much more than normal, especially if there is a family history of diabetes or you are taking diuretics
Even when you are healthy, drink plenty of fluids every day. Drink more when the weather is hot or you are exercising.
Carefully monitor someone who is ill, especially an infant, child, or older adult. If you believe that the person is getting dehydrated, call your health care provider before the person becomes dehydrated. Begin fluid replacement as soon as vomiting and diarrhea start -- DO NOT wait for signs of dehydration.
Always encourage a person who is sick to drink fluids. Remember that fluid needs are greater with a fever, vomiting, or diarrhea. The easiest signs to monitor are urine output (there should be frequent wet diapers or trips to the bathroom), saliva in the mouth, and tears when crying.
Chen L. Infectious diarrheal diseases and dehydration. In: Marx JA, Hockberger RS, Walls RM, et al, eds. Rosenâ€™s Emergency Medicine: Concepts and Clinical Practice. 7th ed. Philadelphia, Pa: Mosby Elsevier; 2009:chap 171.
Greenbaum LA. Deficit therapy. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 10th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 54.
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.