A blood clot in the leg, known medically as Deep vein thrombosis (DVT), 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 promptly.
10 possible warning signs of a blood clot in the leg
- Swelling in one leg
- Often occurs in the calf, ankle, or foot and is usually on only one side.
- Leg pain or tenderness
- May feel like a cramp, soreness, or aching, especially in the calf.
- Warmth in the affected area
- The skin over the clot may feel warmer than the surrounding area.
- Red or discolored skin
- The leg may appear red, purple, or darker than usual.
- A feeling of heaviness in the leg
- The affected limb may feel unusually heavy or tired.
- Pain that worsens when walking or standing
- Movement or pressure on the leg may make discomfort more noticeable.
- Enlarged or more visible veins
- Surface veins may become more prominent due to changes in blood flow.
- Tenderness along a vein
- The area may be painful when touched.
- Sudden unexplained leg symptoms
- New swelling, pain, or color changes without an obvious injury should be taken seriously.
- Symptoms of a clot that has traveled to the lungs
- Seek emergency help for:
- Sudden shortness of breath
- Chest pain (especially with breathing)
- Rapid heartbeat
- Coughing up blood
- Feeling faint or dizzy
Who may be at higher risk?
Risk can increase with:
- Long periods of immobility (such as long travel or bed rest)
- Recent surgery or injury
- Pregnancy or the postpartum period
- Smoking
- Obesity
- Certain medications, including some hormone-based therapies
- Previous blood clots
- Some cancers or chronic illnesses
When to seek help
A new, unexplained one-sided leg swelling, pain, warmth, or redness should be assessed by a healthcare professional, especially if you have risk factors for clots. If you have symptoms suggesting a lung clot, seek emergency medical care immediately.
DVT symptoms can overlap with less serious conditions such as muscle strain or inflammation, so a proper medical evaluation is needed to confirm the cause.
