Dehydration occurs when there is significant loss of body water About Body Water Water accounts for about one half to two thirds of an average person’s weight. Fat tissue has a lower percentage of water than lean tissue and women tend to have more fat, so the percentage... read more and, to varying amounts, electrolytes Overview of Electrolytes Well over half of the body's weight is made up of water. Doctors think about the body's water as being restricted to various spaces, called fluid compartments. The three main compartments are... read more .
Symptoms include thirst, underactivity, dry lips/mouth, and decreased urination.
Severe dehydration can be life-threatening.
Treatment is with fluid and electrolytes given by mouth or, in serious cases, by vein (intravenously).
Dehydration Dehydration Dehydration is a deficiency of water in the body. Vomiting, diarrhea, excessive sweating, burns, kidney failure, and use of diuretics may cause dehydration. People feel thirsty, and as dehydration... read more occurs when the body loses more water than it takes in. Substances called electrolytes Overview of Electrolytes Well over half of the body's weight is made up of water. Doctors think about the body's water as being restricted to various spaces, called fluid compartments. The three main compartments are... read more are lost also. Electrolytes are minerals in the bloodstream and within cells that are essential to life. Sodium Overview of Sodium's Role in the Body Sodium is one of the body's electrolytes, which are minerals that the body needs in relatively large amounts. Electrolytes carry an electric charge when dissolved in body fluids such as blood... read more , potassium Overview of Potassium's Role in the Body Potassium is one of the body's electrolytes, which are minerals that carry an electric charge when dissolved in body fluids such as blood. (See also Overview of Electrolytes.) Most of the body’s... read more , chloride, and bicarbonate are examples of electrolytes.
Dehydration is usually caused by
Excessive fluid loss, such as from vomiting Vomiting in Infants and Children Vomiting is the uncomfortable, involuntary, forceful throwing up of food. In infants, vomiting must be distinguished from spitting up. Infants often spit up small amounts while being fed or... read more and/or diarrhea Diarrhea in Children Diarrhea is a very common problem in children (see also Diarrhea in adults). Diarrhea is frequent, loose, or watery bowel movements (BMs) that differ from a child’s normal pattern. Sometimes... read more
A less common cause of dehydration is
Not drinking enough fluid, such as during common childhood illnesses or when a newborn has trouble breastfeeding Breastfeeding Breast milk is the ideal food for newborns. Although babies may be fed breast milk or formula, the World Health Organization (WHO) and American Academy of Pediatrics (AAP) recommend exclusive... read more
However, not every episode of vomiting, diarrhea, or both causes dehydration.
Dehydrated infants need medical care right away if
The soft spot on their head is sunken.
Their eyes are sunken.
They have no tears when they cry.
Their mouth is dry.
They are not producing much urine.
They have reduced alertness and are underactive (lethargic).
Mild dehydration typically causes a dry mouth and lips and increased thirst, and children may urinate less frequently.
Moderate dehydration causes children to be less interactive or playful, have a dry mouth, and urinate less frequently. Moderate and severe dehydration can cause a rapid heartbeat and lightheadedness.
Severe dehydration causes children to become sleepy or lethargic, which is a sign they must be evaluated by a doctor or taken to the emergency department right away. They have no tears. They may develop a bluish discoloration to the skin (cyanosis Cyanosis Cyanosis is a bluish discoloration of the skin resulting from an inadequate amount of oxygen in the blood. Cyanosis occurs when oxygen-depleted (deoxygenated) blood, which is bluish rather than... read more ) and breathe rapidly. Sometimes dehydration causes the concentration of salt in the blood to fall or rise abnormally. Changes in salt concentration can make the symptoms of dehydration worse and can worsen lethargy. In severe cases, the child can have seizures Seizures in Children Seizures are a periodic disturbance of the brain’s electrical activity, resulting in some degree of temporary brain dysfunction. When older infants or young children have seizures, they often... read more or coma Stupor and Coma Stupor is unresponsiveness from which a person can be aroused only by vigorous, physical stimulation. Coma is unresponsiveness from which a person cannot be aroused and in which the person'... read more or suffer brain damage and die.
Examination by a doctor
Sometimes blood and urine tests
Doctors examine children and note whether they have lost body weight. A loss in body weight over only a few days is very likely caused by dehydration. The amount of weight lost, if known, helps doctors decide whether the dehydration is mild, moderate, or severe.
For moderately or severely dehydrated children, doctors usually do blood and urine tests to determine the levels of electrolytes in their body, the degree of dehydration, and the amount of fluid replacement required.
Replacement of lost fluids
Dehydration is treated with fluids containing electrolytes, such as sodium and chloride. If dehydration is mild, fluids are generally given by mouth. Special oral rehydration solutions are available but are not always necessary for children who have had only mild diarrhea or vomiting. Treatment of dehydration in children of any age who are vomiting is more effective if the child is first given small, frequent sips of fluids about every 10 minutes. The amount of fluid can slowly be increased and given at less frequent intervals if the child can keep the fluid down without vomiting. If diarrhea is the only symptom, larger amounts of fluid can be given less often. If children have both vomiting and diarrhea, they are given small, frequent sips of fluids containing electrolytes. If this treatment increases the diarrhea, children may need to be hospitalized for fluids given by vein (intravenously).
Infants and children who are unable to take in any fluids, or who develop listlessness and other serious signs of dehydration, may require more intensive treatment with fluids and electrolytes given intravenously or electrolyte solutions given through a thin plastic tube (nasogastric tube) that is passed through the nose and down the throat until it reaches the stomach or small intestine.
In infants, dehydration is treated by encouraging an infant to drink fluids that contain electrolytes. Breast milk contains all the fluids and electrolytes an infant needs and is the best treatment when possible. If an infant is not breastfeeding, oral rehydration solutions (ORS) should be given. ORS contains specific amounts of sugars and electrolytes. ORS can be bought as powders that are mixed with water or as premixed liquids at drug or grocery stores without a prescription. The amount of ORS to give a child in a 24-hour period depends on the child’s weight, but generally should be about 1½ to 2½ ounces of ORS for each pound the child weighs (100 to 165 milliliters per kilogram). Thus, a 20-pound infant should drink 30 to 50 ounces total over 24 hours (a 10-kilogram infant should drink 1,000 to 1,650 milliliters total over 24 hours).
Children older than 1 year may try small sips of clear broths or soups, clear sodas, gelatin, or juice diluted to half-strength with water, or popsicles. Plain water, undiluted juice, or sports drinks are not ideal for treating dehydration at any age because the salt content of water is too low and because juice has a high sugar content and ingredients that irritate the digestive tract. ORS is an alternative, particularly for moderate dehydration. If children are able to tolerate fluids for 12 to 24 hours, they may resume their normal diet.