Swollen feet and ankles in Black adults: heart, kidney, or something else

Most swollen feet and ankles are not dangerous. The usual culprits:

• Salt and heat. A high-sodium diet pulls water into your tissues, and hot weather makes blood vessels relax and pool fluid in your lower legs.
• Sitting or standing too long. Gravity wins. Fluid settles in your feet and ankles on long flights, long shifts, and long drives.
• Extra body weight and pregnancy. Both raise pressure in the leg veins.

These cause swelling in both feet, build up gradually, and ease when you put your feet up, cut salt, and move around. If that describes you and you feel otherwise well, watch it for a few days. If it does not improve, or it gets worse, see a doctor.

When the heart cannot pump strongly enough, blood and fluid back up into the legs, ankles, and sometimes the belly and lungs. Swelling in both legs, especially with shortness of breath, waking up breathless at night, or rapid weight gain over a few days, points toward the heart.

This is where the Black-patient angle is not optional. Black adults have the highest rate of heart failure in the country, and it strikes younger. Heart-failure-related death rates are 2.6 times higher in young Black men and nearly 3 times higher in young Black women compared with White men and women, and hospitalization rates run about 2.5 times higher. The biggest driver is high blood pressure: in one major study, three quarters of Black adults who developed heart failure already had a hypertension diagnosis by age 40. Roughly 58% of Black adults have high blood pressure, often more severe and earlier in life than other groups.

The encouraging part: most of that risk is preventable. Controlling blood pressure early changes the outcome. If you have swelling and any breathing symptoms, get checked, and read our guide to heart failure.

Your kidneys balance the salt and water in your body. When they are not clearing fluid properly, it collects in your legs, feet, and around your eyes. Kidney disease is a quiet condition; swelling is sometimes the first thing you notice.

The disparity here is stark. About 20% of non-Hispanic Black adults have chronic kidney disease, compared with about 12% of White adults, and Black people are more than four times as likely to develop kidney failure. Black Americans are about 14% of the population but make up roughly 30% of people living with end-stage kidney disease. Most people with early kidney disease do not know they have it.

A simple blood test (creatinine, used to estimate kidney function) and a urine test can catch it early. If you have swelling plus high blood pressure or diabetes, ask specifically for these. Our chronic kidney disease guide explains the tests and what the numbers mean.

Not all leg swelling comes from the heart or kidneys. Two common plumbing problems:

• Chronic venous insufficiency (CVI). The valves in your leg veins weaken, so blood pools instead of returning to the heart. It causes swelling in the lower legs and ankles that is worse at the end of the day or after standing, often with achiness, skin discoloration, or varicose veins. It affects about 1 in 20 adults and becomes more common with age. CVI usually affects both legs fairly evenly.
• Lymphedema. When the lymph system that drains fluid is blocked or damaged, fluid builds up, often in one limb more than the other. The swelling tends to be uneven and can feel firm.

Neither is usually an emergency, but both are progressive and treatable, so they are worth a diagnosis rather than a guess.

Some medicines cause ankle swelling as a known side effect. The most common offender is amlodipine and other calcium channel blockers, widely prescribed for high blood pressure. They relax small arteries, which raises pressure in the tiny vessels of the feet and pushes fluid into the tissue. The result is swelling in the feet and ankles in roughly 1 in 6 people who take it, more likely at higher doses and with longer use. Other medicines that can cause swelling include certain steroids and some anti-inflammatory pain relievers (NSAIDs).

Important: do not stop a blood pressure medication on your own. Uncontrolled blood pressure is far more dangerous than swollen ankles. Tell your doctor. There are often good alternatives, and pairing the drug with a different class of blood pressure medicine frequently reduces the swelling.

Some foot and ankle swelling is normal in pregnancy. What is not normal is sudden swelling of the face or hands, especially after week 20, paired with headache, vision changes, or upper-belly pain. That combination can signal preeclampsia, a serious blood-pressure complication of pregnancy.

This matters acutely for Black patients. Black women are about three times more likely to die from a pregnancy-related cause than White women, and high blood pressure disorders like preeclampsia are part of that gap. If you are pregnant and notice sudden facial or hand swelling, do not wait for your next appointment. Call your provider or go in the same day.

A good workup for new swelling is quick and low-cost:

• Blood pressure, and a look at which medications you take.
• Urine test for protein, a sign of kidney strain.
• Blood tests for kidney function (creatinine) and sometimes protein/albumin levels, since low blood protein from liver disease, kidney loss, or poor nutrition can also cause swelling.
• A heart check (exam, sometimes an echocardiogram or BNP blood test) if heart failure is suspected.
• A leg ultrasound if a one-sided clot (DVT) is possible.

If you have struggled to be taken seriously, bring specifics: when the swelling started, one leg or both, whether it pits when you press it, and any breathing or chest symptoms. You can also find a Black-serving provider through our directory. Persistent fatigue can travel with these conditions too; if that is part of your picture, see our guide to chronic fatigue causes in Black women.