10 Warning Signs of a Blood Clot in the Leg You Should Know

A blood clot in a deep vein of the leg, known as deep vein thrombosis (DVT), is a serious condition that requires prompt medical attention. If left untreated, part of the clot can break off and travel to the lungs, causing a pulmonary embolism (PE), which is a medical emergency.

Here are 10 warning signs to be aware of:

1. Swelling in One Leg

Sudden swelling in one leg, particularly in the calf or thigh, is one of the most common signs of DVT. The affected leg may appear noticeably larger than the other.

2. Pain or Tenderness

The pain often starts in the calf and may feel like cramping, soreness, or a persistent ache. It may worsen when standing or walking.

3. Warmth Over the Affected Area

The skin over the clot may feel warmer than the surrounding skin because of inflammation.

4. Red or Discolored Skin

The affected area may become red, bluish, or darker than the surrounding skin.

5. Enlarged Surface Veins

Veins near the surface of the skin may become more visible or swollen as blood flow is redirected.

6. Leg Heaviness

Some people experience a feeling of heaviness or tightness in the affected leg, making it uncomfortable to walk.

7. Persistent Calf Cramping

A cramp that doesn’t improve with stretching or rest, especially when accompanied by swelling, should be evaluated.

8. Shiny or Tight Skin

Swelling can make the skin appear stretched, shiny, or feel unusually tight.

9. Pain When Flexing the Foot

Some people notice discomfort in the calf when pulling the toes upward. However, this sign is not reliable on its own and should not be used to diagnose or rule out a blood clot.