10 Warning Signs of a Blood Clot in the Leg (Deep Vein Thrombosis)
A blood clot in a deep vein of the leg is called deep vein thrombosis (DVT). It can be serious because a clot may travel to the lungs and cause a pulmonary embolism. Knowing the warning signs can help you seek care early.
1. Swelling in one leg
A DVT often causes swelling in one leg, especially in the calf, ankle, or foot.
2. Leg pain or tenderness
Pain may feel like a cramp, soreness, or aching—often in the calf or thigh.
3. Warmth in the affected area
The skin over the clot may feel warmer than the surrounding area.
4. Redness or discoloration
The skin may become red, darker, or appear different compared with the other leg.
5. A feeling of heaviness
Some people describe the affected leg as heavy, tight, or uncomfortable.
6. Enlarged or more visible veins
Surface veins may become more noticeable near the affected area.
7. Pain that worsens when standing or walking
Discomfort may increase when pressure is placed on the leg.
8. Sudden unexplained leg swelling
Rapid swelling without an obvious injury should be checked by a healthcare professional.
9. Shortness of breath or chest pain (emergency sign)
If a clot travels to the lungs, symptoms may include:
- Sudden difficulty breathing
- Chest pain (especially with deep breaths)
- Rapid heartbeat
- Coughing, sometimes with blood
10. Dizziness or fainting (emergency sign)
These can be signs of a serious clot-related complication and require urgent medical attention
