Experiencing a sudden tightness in your shoes or noticing deep indentations left by your socks can be alarming. Swelling in the lower extremities—known medically as peripheral edema—occurs when excess fluid becomes trapped in the body’s tissues. Because gravity naturally pulls fluids downward, the feet, ankles, and lower legs are the most frequent targets.
While a mild fluid buildup can happen to anyone after a long day, persistent or sudden swelling can serve as an important communication tool from your body. Understanding the common causes, warning signs, and medical triggers can help you identify when to treat it at home and when it’s time to call a doctor.
10 Common Causes of Swollen Feet and Ankles
1. Prolonged Standing or Sitting
Whether your daily routine requires standing for long hours or sitting passively at a desk, immobility compromises circulation. Without active calf muscle contractions to pump blood back up toward the heart, fluid pools naturally in your lowest extremities.
2. Physical Injury or Trauma
A sudden twist, trip, or impact forces a rush of blood and inflammatory fluid to the lower leg to protect and repair damaged structures. Sprains, fractures, and Achilles tendinitis are classic triggers that cause isolated swelling in one specific foot or ankle.
3. Chronic Venous Insufficiency (CVI)
Your leg veins rely on tiny, one-way valves to push blood upward against gravity. As we age, or due to genetic factors, these valves can weaken or stretch. When they fail, blood flows backward and pools in the lower legs, resulting in a heavy, aching sensation and visible swelling by evening.
4. Medication Side Effects
Many standard prescription drugs alter fluid retention parameters in the body. Common culprits include:
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