Water Retention (Edema): Causes and Treatment

What Is Water Retention?

Water retention, medically known as edema, occurs when excess fluid accumulates in the tissues of the body. Under normal circumstances, the body carefully regulates fluid balance. When this balance is disrupted, fluid from the blood vessels can leak into surrounding tissues, causing visible swelling. The legs, feet, ankles, hands, and face are the most commonly affected areas.

Causes

Water retention can be triggered by a wide range of factors, from harmless, temporary conditions to serious underlying diseases that require medical treatment.

Common Causes

• Heart failure: The heart is unable to pump blood efficiently, leading to fluid buildup in the legs or lungs.
• Kidney disease: The kidneys cannot adequately filter excess water and salt from the body.
• Liver disease: Liver cirrhosis can cause fluid accumulation in the abdomen (ascites) and legs.
• Chronic venous insufficiency: Weakened veins lead to backflow of blood and fluid, particularly in the lower legs.
• Lymphedema: Disruption of the lymphatic system, often following surgery or radiation therapy.
• Hormonal changes: Temporary edema is common before menstruation or during pregnancy.
• Medications: Certain drugs such as calcium channel blockers, corticosteroids, or nonsteroidal anti-inflammatory drugs (NSAIDs) can cause edema.
• Prolonged sitting or standing: Inactivity promotes fluid pooling, especially in the legs.
• Malnutrition: Low blood protein levels (hypoalbuminemia) can lead to edema.

Symptoms

The hallmark sign of water retention is visible and palpable swelling of the affected body parts. Other common symptoms include:

• A feeling of tightness or heaviness in the affected area
• Indentations left in the skin after pressing (pitting edema)
• Shiny or stretched skin over the swollen area
• Reduced range of motion, for example in the ankle or knee joint
• Weight gain due to retained fluid

Diagnosis

Evaluation of water retention begins with a thorough physical examination and medical history review. Depending on the suspected cause, the following diagnostic tests may be used:

• Blood tests: To assess kidney, liver, and heart function as well as protein levels.
• Urinalysis: To detect protein in the urine, which may indicate kidney disease.
• Ultrasound (sonography): To visualize the heart, liver, kidneys, and blood vessels.
• ECG and echocardiography: If a cardiac condition is suspected.
• Chest X-ray: To rule out fluid in the lungs (pulmonary edema).

Treatment

Treatment depends on the underlying cause. Addressing the root cause is essential for long-term improvement.

General Measures

• Elevating the affected limbs to promote fluid drainage
• Regular physical activity to activate the muscle pump
• Reducing dietary salt intake
• Maintaining adequate fluid intake (paradoxically important, as dehydration can worsen edema)

Medication

• Diuretics (water pills): Medications such as furosemide or hydrochlorothiazide stimulate the kidneys to excrete more water and salt.
• Treatment of the underlying condition, such as heart, liver, or kidney medications.

Physical Therapies

• Compression therapy: Compression stockings or bandages support venous and lymphatic function.
• Manual lymphatic drainage: A specialized massage technique that promotes lymph flow, particularly useful for lymphedema.

When to See a Doctor

Water retention should be evaluated by a medical professional if it appears suddenly, is severe, is accompanied by shortness of breath, chest pain, or other symptoms, or does not improve with simple measures. Unilateral leg swelling in particular can indicate a deep vein thrombosis (DVT) and requires immediate medical attention.

References

1. Kasper D. L. et al. - Harrison's Principles of Internal Medicine, 20th Edition, McGraw-Hill Education, 2018.
2. Trayes K. P. et al. - Edema: Diagnosis and Management. American Family Physician, 2013; 88(2): 102-110. Available at: https://www.aafp.org/afp/2013/0715/p102.html
3. World Health Organization (WHO) - Chronic diseases and their common risk factors. Available at: https://www.who.int/news-room/fact-sheets/detail/noncommunicable-diseases