Dehydration In Children: Signs, Causes, Diagnosis & Treatment

check_icon Research-backed

Image: Shutterstock


Dehydration is a term used to describe the excessive loss of water and salts from the body, leading to an electrolyte imbalance in the body (1). Dehydration in children needs prompt attention as they can lose fluids rapidly and develop severe dehydration, which may be critical. In addition, electrolyte imbalance can affect the child’s vital organs or may cause hindrance to normal body functioning.

Dehydration can affect people of all ages and can be mild, moderate, or severe. For mild and moderate cases of dehydration, oral rehydration therapy may resolve the problem by replenishing the lost electrolytes. For severe cases, medical intervention is necessary.

Read on to know more about the signs, causes, diagnosis, treatment, and preventive measures for dehydration in children.

Signs And Symptoms Of Dehydration

The signs and symptoms of dehydration vary depending on the extent of fluid and electrolyte loss. The following are some signs and symptoms that a child with mild to moderate dehydration can exhibit (1) (2) (3).

  • Restlessness and irritability
  • Dry mouth and cracked/parched lips
  • No tears when crying
  • Dark yellow or brown pee
  • Less urination
  • Reduced body weight
  • General weakness and decreased activity than usual
  • Loose stools if dehydration is due to diarrhea
  • Decreased bowel movements if dehydration is due to vomiting or reduced fluid intake

Dehydration, when left untreated, can turn severe and cause the following symptoms.

  • Looking extremely thirsty
  • Sunken eyes
  • Dry, wrinkled, peeling skin due to loss of skin elasticity
  • Discolored hands and feet cold to touch
  • Excessive sleepiness and lethargy
  • Urination no more than once or twice a day
  • Dizziness or drowsiness
  • Increased heart rate
  • Unconsciousness

If your child exhibits any of the symptoms mentioned above, consult your pediatrician to follow the proper management and treatment course.

Causes Of Dehydration

Dehydration can be caused by various factors, including (4) (5)

1. Excessive sweating: Sweating is a normal physiological process that regulates body temperature. During sweating, the body loses salt-based fluids, which one can replenish by drinking fluids. However, excessive sweating can lead to dehydration. Extended exposure to hot and humid weather, excessive exercise or physical activity, and hyperhidrosis can cause dehydration in children. Hyperhydrosis is abnormally excessive sweating that doesn’t happen due to heat exhaustion or exercise (6).

2. Diarrhea and vomiting: In healthy children, occasional diarrhea and vomiting are not a cause for concern. However, explosive diarrhea and frequent vomiting can lead to dehydration. Infections, such as acute viral gastroenteritis (stomach flu), and gastrointestinal diseases, such as celiac disease, can cause excessive water and salt loss from the body, leading to dehydration in children (7) (8).

3. Fever: Some infections and diseases can cause fever. The higher the fever, the greater the risk of dehydration due to sweating. This risk increases if the child doesn’t drink sufficient water and has accompanying conditions, such as diarrhea, vomiting, or both. In such instances, dehydration can set in quickly and turn severe.

4. Certain illnesses: Certain health conditions, such as diarrhea, make drinking water difficult for children and increase the risk for dehydration. This risk amplifies if the child is on certain medications, such as diuretics, which raise fluid loss from the body.

Dehydration in children needs prompt diagnosis and treatment, as it affects acute health risks rather than long-term growth and development.

Diagnosis Of Dehydration

Diagnosing dehydration involves ascertaining the severity of dehydration and determining the precise cause of dehydration. The doctor will examine the child, note the symptoms and collect their medical history.

Based on the suggestive findings, they are likely to perform the following tests to understand the exact cause of dehydration (3) (9).

1. Physical examination: During the physical examination, the doctor will check the child’s vital signs and look for evident signs of dehydration, such as dry mouth and tongue, chapped lips, dry skin, and abnormal skin turgor (wrinkling of the skin due to dehydration). Based on the symptoms, the doctor will measure the level of dehydration using the clinical dehydration scale (CDS).

Clinical dehydration scale: The scale includes point-based dehydration signs and symptoms against which the child’s symptoms are compared. Higher points indicate severe dehydration. Here’s the scale parents can refer to and check their child’s score.




General Appearance


Thirsty, restless, or lethargic but irritable when touched

Drowsy, limp, cold, sweaty



Slightly sunken

Very sunken

Mucous membranes








2. Blood and urine test: A complete blood picture or complete blood count can help the doctor know if the child has an infection. Depending on the result, they may ask for a blood culture to know the specific cause of infection. The doctor may also conduct a urinalysis test to check for UTI.

Treatment For Dehydration

Depending on the child’s age and symptoms and the cause and severity of the symptoms, the doctor will chart a treatment plan. The treatment plan will aim to reestablish water and electrolyte balance, resolve the dehydration cause, and treat complications, if any (3) (10).

  • No dehydration (Score of 0 on CDS)

If the child scores 0 on the dehydration scale, it means they aren’t dehydrated. Such children should have a well-balanced, age-appropriate diet containing healthy fluids, such as soups and coconut water. If the child has vomiting or diarrhea, offer them salt and sugar containing drinks and ORS (oral rehydration solution). Children aged two years and above require half to one cup (250ml) of ORS after each watery stool episode (11).

  • Mild dehydration

One can treat mild dehydration using ORT (oral rehydration therapy), which involves feeding ORS to the child. The doctor may suggest feeding ORS powder or pre-mixed ORS drinks, such as Pedialyte or Hydralyte. These products contain water, sugar, and salts the body needs. One to two teaspoons of ORS every five minutes is appropriate if the child has frequent diarrhea or vomiting.

Once the vomiting and diarrhea subside, the child can have healthy fluids, such as soups, lemonade, and coconut water. Upon recovery, the child can gradually shift to an easy-to-digest, soft diet containing complex carbohydrates, protein-rich lean meats, and various fruits and vegetables to regain lost nutrients and prevent malnutrition.

  • Moderate to severe dehydration

Children with moderate dehydration may need treatment at the hospital. Once they get stable, they can go home and continue with oral rehydration therapy. As the child recuperates and the frequency of diarrhea and vomiting reduces, they may be introduced to a soft diet.

Children with severe dehydration need to be administered intravenous fluids (IV) until they are stable and comfortable taking oral fluids.

Note: Feeding only water to treat mild to moderate dehydration may not be sufficient. It can lead to low blood sugar or low sodium in the blood.

Complications Of Dehydration

Dehydration doesn’t lead to complications if treated on time. However, if it persists or worsens, it can lead to severe complications, including (12) (13)

  • Reduced blood pressure due to low blood volume, resulting in hypovolemic shock.
    • Low blood sodium (hyponatremia).
    • Severe electrolyte loss leading to seizures.
    • Urinary tract infections (UTIs) and kidney problems.
    • Shortage of oxygen in the blood (hypoxemia).
    • Brain damage and death.
  • Malnutrition affecting growth and development.

How To Prevent Dehydration In Children?

Dehydration is preventable in most cases. You can follow the following steps to ensure your child is well hydrated.

1. Ensure your child drinks plenty of water. Experts recommend children aged four to eight years drink at least seven cups of water per day. On the other hand, children aged nine to 18 should drink nine to ten cups (14). The total water requirement can be higher depending on the child’s physical activity and climatic conditions.

2. Make your child drink extra fluids, such as fresh, homemade lemonade and coconut water when the weather is hot and humid. Watch your child’s clothing is weather-appropriate so that they do not sweat excessively.

3. Avoid feeding drinks containing sugar and caffeine as they act as diuretics, which can cause water and electrolyte loss from the body.

4. Remind your child to drink water and other fluids if they tend to forget drinking water. You may use water reminder apps for older children who have mobile phones.

5. Plan and feed your child various fluids in the form of cordials, lemonade, popsicles, fruit-infused water, or ice chips if they refuse to drink sufficient amounts of water.

6. Pay heed to the signs of dehydration when your child is sick. Promptly follow appropriate measures, such as feeding ORS to replenish lost fluids.

7. Monitor the number of times your child vomits or passes loose or watery stools. Hydrate your child to keep their mouth moist and urine output normal.

8. Ensure your child drinks plenty of water and ORS if they do intensive exercise or indulge in high-intensity sports, which usually cause excessive water loss. Avoid using commercial sports drinks as they often contain high amounts of sugar.

9. Guide your child to drink water before and after exercise or sports activity. They should sip water at regular intervals during the activity to help replenish lost fluids.

10. Reduce dehydration risk by planning your child’s outdoor and sports activities in the morning or evening hours if you stay in a hot and humid environment.

Frequently Asked Questions

1. When should I be worried if my child is dehydrated?

If your child has recurrent vomiting or persistent diarrhea, consult a medical advisor for prompt medical attention. It is also safe to visit a doctor if your child refuses to take fluids or repeatedly vomits after consuming them.

2. How can I get my child to drink more water?

A few simple changes to your family’s lifestyle could enable your child to consume more water. Encourage your children to carry filled water bottles with them. Give them attractive water bottles to encourage them to drink often. As they learn from others, you must also consume water frequently in their presence. You could use frozen fruit as ice cubes to add taste to the water.

3. How long does dehydration last?

Mild dehydration might start to improve five to ten minutes after consuming liquids. Moderate dehydration might require an IV (15). Mild dehydration is a stage that you can manage by having more fluids, but you might have to visit a doctor when you have moderate dehydration.

Dehydration in children leads to the loss of water and salts from the body. It may be caused by excessive sweating, fever, or diarrhea. Children may experience dry mouth, irritability, and less urination during mild to moderate dehydration. However, if the condition is not treated on time, severe cases may lead to sunken eyes, increased heart rate, and lethargy. Mild dehydration can be treated with prompt oral rehydration. You may give your child plain water, ORS, or coconut water to help restore the electrolyte balance. However, if the dehydration is severe, medical treatment becomes essential. Therefore, stay alert and prevent dehydration by regularly offering fluids in different forms to children.

Key Pointers

  • Signs of dehydration in children include restlessness, irritability, dry mouth, less urination, and reduced body weight.
  • It may be caused by diarrhea, sweating, vomiting, fever, and other illnesses.
  • It can be managed by a well-balanced diet, including fluids and ORS drinks.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Diarrhoea;WHO
2. Signs of Dehydration in Infants & Children;AAP
3. Dehydration About Kids Health; The Hospital For Sick Children
4. Dehydration Kids Health From Nemours
5. DehydrationThe Royal Children’s Hospital, Melbourne
6. Don’t Let Them See You Sweat This Summer; International Hyperhidrosis Society
7. Viral Gastroenteritis; Cedars Sinai
8. Nadia Waheed et al.;Celiac Crisis: A Rare Or Rarely Recognized Disease;NCBI
9. DehydrationMayo Foundation for Medical Education and Research
10. DehydrationNHS
11. Diarrhoea;UNICEF
12. Dehydration: Pediatric;Saskatchewan Registered Nurses Association
13. Dehydration;American Academy of Family Physicians
14. Water: How Much Do Kids Need?;Academy Of Nutrition And Dietetics
15. Dehydration; Cleveland Clinic
Was this information helpful?
The following two tabs change content below.

Swati Patwal

Swati Patwal is a clinical nutritionist, a Certified Diabetes Educator (CDE) and a toddler mom with over eight years of experience in diverse fields of nutrition. She started her career as a CSR project coordinator for a healthy eating and active lifestyle project catering to school children. Then she worked as a nutrition faculty and clinical nutrition coach in different... more

Dr. Supriya Mahajan

Dr. Supriya Mahajan is a pediatrician and pediatric hepatologist with nine years of experience. She completed her MBBS from Shyam Shah Medical College and diploma from the National Board of Education, New Delhi. She went on to gain specialization in the gut and liver-related diseases in children from the Institute of Liver and Biliary Sciences and MRCPCH 1, 2 from... more