How heart failure leads to swollen legs
With heart failure, leg swelling and skin problems often go together. Heart failure means the heart does not pump as well as the body needs. Blood returning from the legs backs up, pressure in the veins rises, and the kidneys hold on to salt and water. The extra fluid seeps out of small blood vessels into the tissue.
Gravity pulls that fluid down to the feet, ankles and shins, or to the hips and lower back for someone in bed. Clinicians call this swelling edema. It usually affects both legs and often dents when pressed.
What swelling does to skin
Skin is not built to stay stretched for weeks:
- The skin becomes tight, thin and shiny, and a light bump can tear it.
- Fluid in the tissue slows the delivery of oxygen to skin cells, so repair is slower.
- Blisters can form, and clear or pale yellow fluid may seep through the skin, which is often called weeping.
- Skin that stays wet turns soft and sore, and germs get in more easily.
A small break in swollen skin can become a leg wound that is slow to close. See leg swelling and weeping skin, and our guide to leg swelling and wounds for other causes of swelling.
What to watch and write down
A daily record helps your clinicians see a change early:
- Weight. Many heart teams ask for a morning weight on the same scale, after using the bathroom and before breakfast.
- Swelling. How far up the leg it goes, whether socks leave deeper marks and whether shoes still fit.
- Breathing. Shortness of breath, needing more pillows, or waking up breathless.
- Skin. New blisters, wet patches, redness, warmth or open spots.
Some practices offer remote patient monitoring, which sends weight and blood pressure readings to the care team between visits.
Skin care habits to ask about
Check these habits with your clinician first, because the right plan depends on your heart, your circulation and any open areas:
- Wash gently with mild soap and pat dry, including between the toes.
- Protect your shins from furniture edges and pet claws, and keep walkways clear.
- Raise your legs when sitting, if it is comfortable and does not make breathing harder.
If you sleep in a recliner because lying flat is hard, tell your clinician. That detail matters for your heart and for your legs.
Compression and water pills
Compression wraps and stockings are common treatments for leg swelling, but they are not always right for someone with heart failure. Squeezing fluid out of the legs sends it back toward the heart. A clinician needs to judge whether your heart can handle that and whether blood flow to your feet is good enough. Ask before using stockings you already own. See our guide to compression therapy.
Water pills (diuretics) help the body release extra fluid. The prescriber adjusts them using your weight, your symptoms and blood tests that check the kidneys. Do not take extra or skip doses on your own. If they cause dizziness, cramps or too many trips to the bathroom, tell the prescriber.
Questions worth asking:
- What weight change should I call about?
- How much salt and fluid is right for me?
- Is compression safe for me right now, and what kind?
How heart care and wound care work together
A wound care clinician may see your legs more often than anyone else and be the first to notice swelling creeping up. That observation only helps if it reaches the clinician who manages your heart.
Gateway arranges wound care and heart and blood pressure follow-up with partner clinicians in Greater St. Louis and the Metro East. With your permission, we pass notes and questions among the wound care team, the primary care clinician and your cardiologist. Treating clinicians make all decisions about medications and compression. See also lymphedema and edema management.
Call 314-325-0126, or send the request care form with a name and phone number only.
When to call the clinician and when to call 911
Call the treating clinician’s office about:
- Weight gain beyond the amount your heart team told you to report
- Swelling that is rising higher on the legs
- New blisters, weeping or open areas
- Redness, warmth or tenderness, with or without fever
One leg that suddenly becomes more swollen or painful than the other needs to be checked right away, because it can be a sign of a blood clot.
Call 911 for severe shortness of breath, chest pain or pressure, coughing up pink or frothy mucus, fainting or sudden confusion. Gateway is not an emergency service.
Common questions
Why do my legs leak clear fluid?
When tissue holds more fluid than it can contain, the fluid escapes through tiny breaks in stretched skin or through broken blisters. It keeps the skin wet and raises the chance of infection, so report it instead of just padding it with towels.
Why is the swelling worse in the evening than in the morning?
Fluid follows gravity. After a day of sitting or standing, it collects in the feet and ankles. Overnight, with your legs level with your body, some of it moves back into the bloodstream. Swelling that no longer goes down overnight is a change to report.
Should I drink less water to bring the swelling down?
Do not restrict fluids on your own. Some people with heart failure are given a daily fluid limit, and others are not. Drinking too little can harm the kidneys and cause dizziness. Ask the clinician who manages your heart what amount is right for you.
Will my skin go back to normal once the swelling is controlled?
Often it improves. Tightness and weeping usually ease as fluid comes down, and small open areas can close. Skin that has been swollen for a long time may stay darker, drier or thicker, and it remains easier to injure. Keep protecting it even when your legs look better.
Related pages
General information to help you talk with your own clinician. It is not medical advice, and the treating clinician makes every clinical decision. For a medical emergency, call 911.
Updated October 2026