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Fluid imbalance

Show Alternative Names
Water imbalance
Fluid imbalance - dehydration
Fluid buildup
Fluid overload
Volume overload
Loss of fluids
Edema - fluid imbalance
Hyponatremia - fluid imbalance
Hypernatremia - fluid imbalance
Hypokalemia - fluid imbalance
Hyperkalemia - fluid imbalance

Every part of your body needs water to function. When you are healthy, your body is able to balance the amount of water that enters or leaves your body.

A fluid imbalance may occur when you lose more water or fluid than your body can take in. It can also occur when you take in more water or fluid than your body is able to get rid of.

Causes

Your body is constantly losing water through breathing, sweating, and urinating. If you do not take in enough fluids or water, you become dehydrated.

Your body may also have a hard time getting rid of fluids. As a result, excess fluid builds up in the body. This is called fluid overload (volume overload). This can lead to edema (excess fluid in the skin and tissues).

Many medical problems can cause fluid imbalance:

  • After surgery, the body often retains large amounts of fluid for several days, causing swelling of the body.
  • In heart failure, fluid collects in the lungs, liver, blood vessels, and body tissues because the heart does a poor job of pumping it to the kidneys.
  • When the kidneys do not work well because of long-term (chronic) kidney disease, the body cannot get rid of unneeded fluids.
  • The body may lose too much fluid due to diarrhea, vomiting, severe blood loss, or high fever.
  • Lack of a hormone called antidiuretic hormone (ADH) can cause the kidneys to get rid of too much fluid. This results in extreme thirst and dehydration.

Often, a high or low blood level of sodium or potassium is present as well.

Medicines can also affect fluid balance. The most common are water pills (diuretics) to treat blood pressure, heart failure, liver disease, or kidney disease.

Treatment

Treatment depends on the specific condition that is causing the fluid imbalance.

When to Contact a Medical Professional

Contact your health care provider if you or your child has signs of dehydration or swelling, in order to prevent more serious complications.

Text only

Review Date: 11/6/2021

Reviewed By

David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

References

Berl T, Sands JM. Disorders of water metabolism. In: Feehally J, Floege J, Tonelli M, Johnson RJ, eds. Comprehensive Clinical Nephrology. 6th ed. Philadelphia, PA: Elsevier; 2019:chap 8.

Hall JE, Hall ME. Urine concentration and dilution: regulation of extracellular fluid osmolarity and sodium concentration. In: Hall JE, Hall ME, eds. Guyton and Hall Textbook of Medical Physiology. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 29.

Disclaimer

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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