Swollen feet (often called edema) is not a single clear sign of one disease—it can come from several different causes, some mild and some serious.
Here are the most common possibilities:
Common (usually less serious) causes
- Standing or sitting for long periods → fluid collects in the lower legs
- High salt intake → body retains water
- Hot weather → blood vessels expand, causing fluid buildup
- Minor injury or strain
- Certain medicines (like some blood pressure drugs)
Medical causes that need attention
- Heart problems (heart doesn’t pump efficiently → fluid buildup in legs)
- Kidney disease (can’t remove extra fluid properly)
- Liver disease (low protein levels cause swelling)
- Vein problems (varicose veins / poor circulation)
- Lymphatic blockage (lymphedema)
- Infections or inflammation
Warning signs (seek medical help urgently if present)
- Swelling in only one leg with pain or redness
- Shortness of breath or chest pain
- Sudden or rapidly worsening swelling
- Swelling with fever or skin warmth
- Swelling along with fatigue, reduced urination, or weight gain
Simple self-care (if mild and no red flags)
- Elevate feet above heart level
- Reduce salt intake
- Walk or move regularly
- Avoid sitting or standing too long
- Drink enough water
If you want, tell me:
- age of the person
- whether swelling is in one foot or both
- any other symptoms
I can help narrow down the likely cause.