Swollen feet and ankles in older adults most often result from fluid building up in the lower legs, a condition called peripheral edema. The most common causes are heart failure, venous insufficiency (weakened leg veins), kidney disease, liver disease, and medication side effects. Because several of these conditions become more prevalent after age 50, swelling in the feet and ankles is extremely common among older adults and almost always warrants a closer look at what’s driving it.
Heart Failure and Fluid Backup
Congestive heart failure is one of the leading causes of leg and ankle swelling in the elderly. It happens when the heart can no longer pump blood efficiently enough to meet the body’s needs. The heart is still working, but because it can’t move the volume of blood it should, fluid backs up in other parts of the body. Most of the time, it collects in the lungs, legs, and feet.
The process usually starts on the left side of the heart. When the left pumping chamber struggles, blood backs up and eventually puts pressure on the right side too. That pressure pushes fluid out of blood vessels and into surrounding tissue, especially in the lower legs where gravity pulls it downward. If the swelling is accompanied by shortness of breath, fatigue, or difficulty lying flat, heart failure is a strong possibility.
Venous Insufficiency
Your leg veins contain one-way valves that push blood upward toward the heart, working against gravity with every step. Over time, these valves can weaken or become damaged. When that happens, blood flows backward and pools in the lower legs, a situation called venous reflux. Chronic venous insufficiency affects about 1 in 20 adults overall and becomes significantly more common after age 50.
The swelling from venous insufficiency tends to worsen throughout the day, especially after long periods of standing or sitting. You may also notice skin discoloration on the lower legs, a heavy or aching sensation, or visible varicose veins. Unlike heart failure, venous insufficiency doesn’t typically cause shortness of breath or fatigue, which can help distinguish between the two.
Kidney and Liver Disease
The kidneys regulate how much fluid stays in your body. When they aren’t filtering properly, excess water and sodium accumulate and settle into the lowest points: the feet and ankles. Kidney-related swelling often shows up in both legs symmetrically and may also cause puffiness around the eyes in the morning.
Liver disease contributes to swelling through a different mechanism. A damaged liver produces less albumin, a protein that helps keep fluid inside blood vessels. When albumin levels drop, fluid leaks out into surrounding tissues. Advanced liver disease can also cause the abdomen to swell with fluid, a condition called ascites. Other signs include yellowing of the skin or eyes.
Medications That Cause Swelling
Several medications commonly prescribed to older adults list swelling as a side effect. Calcium channel blockers, a widely used class of blood pressure drugs, are among the most frequent culprits. Nearly half of people who take them experience some degree of foot and ankle swelling. Amlodipine is a well-known example.
Other medications that can trigger lower leg swelling include:
- Blood pressure drugs such as beta blockers, clonidine, and hydralazine
- Anti-inflammatory painkillers (NSAIDs) like ibuprofen and naproxen
- Hormone medications including corticosteroids, estrogen, and testosterone
- Nerve pain and seizure drugs such as gabapentin and pregabalin
- Certain diabetes medications like pioglitazone
If swelling appeared or worsened shortly after starting a new medication or changing a dose, the drug is a likely contributor. Don’t stop taking a prescribed medication on your own, but it’s worth raising the timing with a doctor.
Too Much Sodium
Excess sodium causes the body to retain water, and that extra fluid tends to collect in the feet and ankles. The World Health Organization recommends less than 2,000 mg of sodium per day for adults, which works out to just under a teaspoon of salt. Most people consume well above that threshold without realizing it, because sodium is concentrated in processed foods: breads, deli meats, canned soups, snack foods, and condiments like soy sauce.
For older adults who already have a heart, kidney, or liver condition, high sodium intake compounds the problem. Even modest reductions in salt can make a noticeable difference in swelling over a period of days.
Inactivity and Prolonged Sitting
Movement is essential for pushing blood back up from the legs. The calf muscles act as a pump, squeezing veins with each step and propelling blood toward the heart. When an older adult sits or stands in one position for hours, that pump barely engages, and fluid pools in the ankles and feet. This is one reason swelling tends to be worse at the end of the day and improves overnight.
Even gentle activity, like short walks or flexing the feet while seated, helps activate that calf pump. Elevating the legs to just above heart level while sitting or lying down also encourages fluid to drain back toward the torso.
One-Sided vs. Both-Sided Swelling
The pattern of swelling matters. When both feet and ankles swell symmetrically, the cause is usually systemic: heart failure, kidney disease, medication effects, or too much sodium. This type of swelling develops gradually and fluctuates throughout the day.
Swelling in only one leg is a different situation and raises concern for a deep vein thrombosis (DVT), a blood clot in a deep leg vein. DVT symptoms include leg pain or cramping (often starting in the calf), warmth in the affected leg, and skin that turns red or purple. DVT can sometimes cause no noticeable symptoms at all, which makes it particularly dangerous. A clot that breaks free can travel to the lungs and become life-threatening.
How Swelling Is Assessed
Doctors evaluate swelling by pressing a finger into the swollen area and watching what happens. If the pressure leaves a visible dent that takes time to bounce back, it’s called pitting edema. The depth of the dent and how long it takes to refill tell the doctor how severe the swelling is. A shallow dent that rebounds immediately is mild (grade 1), while a deep dent of 8 mm or more that takes two to three minutes to fill back in is severe (grade 4). This simple test helps guide decisions about what’s causing the problem and how urgently it needs treatment.
Warning Signs That Need Immediate Attention
Most ankle swelling in older adults develops slowly and reflects a manageable condition. But certain combinations of symptoms signal something more urgent. Seek immediate care if swelling occurs alongside:
- Shortness of breath or difficulty breathing
- Chest pain
- Coughing or vomiting blood
- Severe pain in the swollen area
- Sudden swelling in only one leg
- Fever
- Yellowing of the skin or eyes
Swelling that stops you from going about your normal daily activities also deserves prompt medical evaluation, even without the symptoms above. In older adults with a history of heart, lung, liver, or kidney disease, new or worsening swelling is always worth reporting, because it often signals that a known condition is progressing or that a treatment plan needs adjustment.