Learn About Dehydration

What is the definition of Dehydration?

Dehydration occurs when your body does not have as much water and fluids as it needs.

Dehydration can be mild, moderate, or severe, based on how much of your body's fluid is lost or not replaced. Severe dehydration is a life-threatening emergency.

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What are the alternative names for Dehydration?

Vomiting - dehydration; Diarrhea - dehydration; Diabetes - dehydration; Stomach flu - dehydration; Gastroenteritis - dehydration; Excessive sweating - dehydration

What are the causes of Dehydration?

You can become dehydrated if you lose too much fluid, do not drink enough water or fluids, or both.

Your body may lose a lot of fluid from:

  • Sweating too much, for example, from exercising in hot weather
  • Fever
  • Vomiting or diarrhea
  • Urinating too much (uncontrolled diabetes or some medicines, like diuretics, can cause you to urinate a lot)

You might not drink enough fluids because:

  • You do not feel like eating or drinking because you are sick
  • You are nauseated
  • You have a sore throat or mouth sores

Older adults and people with certain diseases, such as diabetes, are also at higher risk for dehydration.

What are the symptoms of Dehydration?

Signs of mild to moderate dehydration include:

  • Thirst
  • Dry or sticky mouth
  • Not urinating much
  • Darker yellow urine
  • Dry, cool skin
  • Headache
  • Muscle cramps

Signs of severe dehydration include:

  • Not urinating, or very dark yellow or amber-colored urine
  • Dry, shriveled skin
  • Irritability or confusion
  • Dizziness or lightheadedness
  • Rapid heartbeat
  • Rapid breathing
  • Sunken eyes
  • Listlessness
  • Shock (not enough blood flow through the body)
  • Unconsciousness or delirium
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What are the current treatments for Dehydration?

To treat dehydration:

  • Try sipping water or sucking on ice cubes.
  • Try drinking water or sports drinks that contain electrolytes.
  • Do not take salt tablets. They can cause serious complications.
  • Ask your provider what you should eat if you have diarrhea.

For more severe dehydration or heat emergency, you may need to stay in a hospital and receive fluid through a vein (IV). The provider will also treat the cause of the dehydration.

Dehydration caused by a stomach virus should get better on its own after a few days.

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What is the outlook (prognosis) for Dehydration?

If you notice signs of dehydration and treat it quickly, you should recover completely.

What are the possible complications of Dehydration?

Untreated severe dehydration may cause:

  • Death
  • Permanent brain damage
  • Seizures
When should I contact a medical professional for Dehydration?

You should call 911 or the local emergency number if:

  • The person loses consciousness at any time.
  • There is any other change in the person's alertness (for example, confusion or seizures).
  • The person has a fever over 102°F (38.8°C).
  • You notice symptoms of heatstroke (such as rapid pulse or rapid breathing).
  • The person's condition does not improve or gets worse despite treatment.
How do I prevent Dehydration?

To prevent dehydration:

  • Drink plenty of fluids every day, even when you are well. Drink more when the weather is hot or you are exercising.
  • If anyone in your family is ill, pay attention to how much they are able to drink. Pay close attention to children and older adults.
  • Anyone with a fever, vomiting, or diarrhea should drink plenty of fluids. DO NOT wait for signs of dehydration.
  • If you think you or someone in your family may become dehydrated, call your provider. Do this before the person becomes dehydrated.
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What are the latest Dehydration Clinical Trials?
Efficacy, Safety and Response Predictors of Adjuvant Astragalus for Cognition in Hypotension: an add-on, Assessor-blind, Parallel, Pragmatic Randomized Controlled Trial

Background: The presence of hypotension in adults increases their risk of cognitive impairment. Recent big data studies showed that add-on Astragalus membranaceus (AM) can effectively improve the state of hypotension. The effectiveness of add-on AM in improving cognitive function in hypotension has not been established. Therefore, this study aims to determine the efficacy and safety of add-on AM treatment in ...

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Effect of Astragalus Membranaceus on the Improvement of Cognitive Function in Patients With Hypotension: a Randomized Controlled Trial Protocol

Summary: The presence of hypotension in older adults increases their risk of cognitive decline. Astragalus membranaceus treatment can effectively improve the state of hypotension. In adults with both hypotension and cognitive impairment, the effectiveness of astragalus in improving their cognitive function has not been established. Therefore, this study aims to determine the efficacy and safety of Astragal...

What are the Latest Advances for Dehydration?
Intratumoral oncolytic virus V937 plus ipilimumab in patients with advanced melanoma: the phase 1b MITCI study.
Hypercalcemia: A Review.
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Identification of Wernicke Encephalopathy in a Patient Presenting With Altered Mental Status and Dehydration.
Who are the sources who wrote this article ?

Published Date: August 10, 2021
Published By: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

What are the references for this article ?

Kenefick RW, Cheuvront SN, Leon LR, O'Brien KK. Dehydration and rehydration. In: Auerbach PS, Cushing TA, Harris NS, eds. Auerbach's Wilderness Medicine. 7th ed. Philadelphia, PA: Elsevier; 2017:chap 89.

Padlipsky P, McCormick T. Infectious diarrheal disease and dehydration. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 172.