Why do ankles swell? How can you prevent it? | July 17, 2025

If your ankles tend to swell by the end of the day, it may be more than just an annoyance—it could be your body signaling a deeper issue.

Experts from the Cleveland Clinic and Harvard Medical School note that ankle swelling—technically called peripheral edema—can result from simple lifestyle choices or more serious medical conditions. Identifying the underlying cause is crucial for effective treatment and prevention.

What Is Edema, and Why Do Ankles Swell?
Swelling in the ankles is typically caused by fluid accumulating in the body’s tissues, a condition known as edema.

Because of gravity, the feet and ankles are particularly vulnerable, especially after long periods of sitting or standing. In such cases, blood circulation slows, and the lymphatic system may struggle to remove excess fluid efficiently.

Common Causes of Swollen Ankles
1. Prolonged Sitting or Standing
Remaining in one position for too long, such as during long flights or extended desk work, can hinder blood flow, allowing it to pool in the lower legs.

2. Water Retention
Factors like high salt consumption, dehydration, or hormonal shifts can cause your body to hold onto fluid, especially in the lower limbs by day’s end.

3. Circulatory Issues
Conditions such as chronic venous insufficiency—when veins struggle to push blood back to the heart—can lead to swelling from blood pooling in the legs.

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