|Classification and external resources|
Hypervolemia, or fluid overload, is the medical condition where there is too much fluid in the blood. The opposite condition is hypovolemia, which is too little fluid volume in the blood. Fluid volume excess in the intravascular compartment occurs due to an increase in total body sodium content and a consequent increase in extracellular body water. The mechanism usually stems from compromised regulatory mechanisms for sodium handling as seen in congestive heart failure (CHF), kidney failure, and liver failure. It may also be caused by excessive intake of sodium from foods, intravenous (IV) solutions and blood transfusions, medications, or diagnostic contrast dyes.
Excessive sodium and fluid intake:
- IV therapy containing sodium
- As a Transfusion reaction to a rapid blood transfusion.
- High intake of sodium
Sodium and water retention:
- Heart failure
- Liver cirrhosis
- Nephrotic syndrome
- Corticosteroid therapy
- Low protein intake
Fluid shift into the intravascular space:
- Fluid remobilization after burn treatment
- Administration of hypertonic fluids, e.g. mannitol or hypertonic saline solution
- Administration of plasma proteins, such as albumin
Signs and symptoms 
The excess fluid, primarily salt and water, builds up in various locations in the body and leads to an increase in weight, swelling in the legs and arms (peripheral edema), and/or fluid in the abdomen (ascites). Eventually, the fluid enters the air spaces in the lungs, reduces the amount of oxygen that can enter the blood, and causes shortness of breath (dyspnea), which is the best indicator of estimating central venous pressure is increased. Fluid can also collect in the lungs when lying down at night, possibly making nighttime breathing and sleeping difficult (paroxysmal nocturnal dyspnea).
See also 
- Volume status
- Fluid balance
- Anasarca (swelling of skin)
- Pleural effusion (excess fluid in the pleural cavity)
- Low pressure receptor zones
- Page 62 (Fluid imbalances) in: Portable Fluids and Electrolytes (Portable Series). Hagerstwon, MD: Lippincott Williams & Wilkins. 2007. ISBN 1-58255-678-4.
- "Complications of Transfusion: Transfusion Medicine: Merck Manual Professional". Retrieved 2009-02-09.
- The MERCK MANUALS > Hyponatremia Last full review/revision May 2009 by James L. Lewis, III, MD
- Hypervolemia symptoms, causes, diagnosis, treatment, and general details
- How Heart Failure causes fluid accumulation – An animated journey through Heart Failure
- CRISP Thesaurus 00004009
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