Why do elderly people experience leg and foot swelling?

As people age, their bodily functions gradually decline, often leading to swelling in the feet and legs. This swelling typically results from excessive fluid accumulation in the interstitial spaces surrounding leg blood vessels, manifesting as increased limb girth and heightened muscle tension. Additionally, diminished function of the heart, liver, or kidneys may also contribute to edema in the legs and feet. So, what causes leg and foot swelling in older adults? Below, we address this question.

Causes of Leg and Foot Swelling in Older Adults

1. Medication-related factors

Certain medications—including corticosteroids, testosterone, other androgens, insulin, and licorice—may cause facial, hand, or foot edema. Such swelling usually resolves gradually after discontinuing the medication. Drug-induced edema is generally benign and requires no specific intervention; however, if swelling stems from an underlying disease, prompt diagnosis and treatment of the primary condition are essential. Moreover, excessive dietary salt intake can also contribute to leg and foot swelling.

2. Reduced kidney function

When kidney function deteriorates, the body’s ability to regulate sodium balance becomes impaired, potentially resulting in generalized edema—not limited solely to the legs and feet. Common renal conditions associated with leg and foot swelling—such as pyelonephritis and glomerulonephritis—deserve particular attention. Hypertension and kidney health are closely and intricately linked; untreated or poorly controlled hypertension can damage renal blood vessels, compromising blood supply to the kidneys.

3. Impaired venous return

Venous insufficiency in the lower limbs—often due to incompetent venous valves, reduced venous elasticity, or poor venous return—can impede effective blood flow back to the heart, causing blood and fluid to pool in the legs and feet, thereby inducing edema. This condition is particularly common among elderly individuals. Should symptoms arise, timely medical evaluation is crucial to determine the underlying cause of lower-limb edema and initiate appropriate treatment. Additionally, incorporating diuretic foods—such as coix seed (Job’s tears), winter melon, red beans, celery, and corn—into the diet may help maintain fluid balance.

The above outlines the primary causes of leg and foot swelling in older adults. We hope this information proves helpful.