Swollen legs in older adults are often linked to normal aging changes, but they can also point to underlying health problems. As the body ages, “circulation, kidney function, and lymphatic drainage” become less efficient, which increases the risk of fluid buildup in the lower legs where gravity has the strongest effect.

One major cause is poor circulation. “Blood vessels lose elasticity over time,” and the calf muscles, often called the “second heart,” may not pump blood upward as well when physical activity decreases. This can lead to blood and fluid pooling in the ankles and feet, especially after long periods of sitting or standing.

Another important factor is “fluid retention (edema),” which can develop when the heart, kidneys, or liver are not working properly. High salt intake can worsen the condition by increasing water retention. Certain medications for blood pressure, pain, or inflammation may also contribute to swelling, particularly when multiple drugs are used.

Reduced physical activity also plays a role. Movement helps circulate blood and lymph fluid, while inactivity allows fluid to collect in the lower limbs. Even light daily exercise such as walking or gentle leg movements can noticeably improve circulation and reduce swelling.

In some cases, swelling may signal more serious conditions like deep vein thrombosis (DVT), especially if it appears suddenly or affects only one leg and requires urgent attention. Common management includes elevating the legs, using compression stockings, staying active, and reducing salt intake, but persistent or painful swelling should always be evaluated by a healthcare professional.