10 Warning Signs of a Blood Clot in the Leg You Should Know
A blood clot in a deep vein of the leg is called deep vein thrombosis (DVT). It can become dangerous if part of the clot travels to the lungs, causing a pulmonary embolism. Some DVTs cause few or no symptoms, but possible warning signs include:
- Swelling in one leg — Often affecting the calf, ankle, or entire leg.
- Pain or tenderness — Frequently felt in the calf and may worsen when standing or walking.
- Warmth — The affected area may feel warmer than the other leg.
- Red or discolored skin — The skin can become reddish, bluish, or darker than usual.
- A feeling of heaviness — The affected leg may feel unusually heavy or tight.
- Tight or stretched skin — Swelling can make the skin feel unusually tense.
- Enlarged or prominent veins — Veins near the surface may become more noticeable.
- Pain that develops without an obvious injury — Unexplained leg discomfort deserves attention, particularly with swelling.
- Tenderness along a vein — The area may be painful when touched.
- Symptoms affecting mainly one side — Unexplained swelling, warmth, and pain occurring together in one leg are particularly concerning.
🚨 Know the emergency signs
A DVT can lead to a pulmonary embolism. Get emergency medical help immediately if you develop sudden shortness of breath, chest pain (especially with breathing), coughing up blood, fainting, or a rapid heartbeat.
These symptoms can have other causes, so they don’t prove that you have a blood clot. If you develop unexplained one-sided leg swelling or pain, seek prompt medical evaluation rather than trying to diagnose it yourself.
