10 Warning Signs of a Blood Clot in the Leg (DVT)
A blood clot in a deep vein is called deep vein thrombosis (DVT). It most often develops in one leg. Importantly, some DVTs cause few or no symptoms, so symptoms alone cannot rule one out.
1. Sudden swelling
One leg or foot may become noticeably more swollen than the other.
2. Pain or tenderness
Pain may occur in the calf or thigh and can feel like an ache, cramp, or soreness.
3. Warmth
The affected area may feel warmer than the other leg.
4. Red or discolored skin
The skin can become red, purplish, or darker than usual.
5. Tight or stretched skin
Swelling may make the skin feel unusually tight.
6. Heaviness in one leg
The affected leg may feel heavy or unusually uncomfortable.
7. Pain that worsens with walking or standing
Discomfort may become more noticeable when you move or put weight on the leg.
8. Swelling that develops without an obvious injury
Unexplained swelling—particularly when it’s only on one side—deserves medical assessment.
9. Enlarged or more prominent veins
Veins near the skin may become more visible because blood flow is being obstructed.
10. Unexplained calf discomfort or cramping
A DVT can sometimes resemble an ordinary muscle cramp, which is why persistent or unexplained symptoms shouldn’t simply be assumed to be a cramp.
🚨 The most important warning: symptoms of a pulmonary embolism
A clot can break away and travel to the lungs, causing a pulmonary embolism (PE). Seek emergency medical care immediately if you develop:
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Sudden shortness of breath
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Chest pain, especially with breathing
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Coughing up blood
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Rapid heartbeat
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Fainting or severe dizziness
Who has higher risk?
Risk increases with recent surgery or hospitalization, prolonged immobility or long-distance travel, pregnancy/postpartum, previous DVT/PE, some cancers, estrogen-containing medications, obesity, smoking, and certain inherited clotting disorders.
Don’t massage a leg that is suddenly swollen and painful if DVT is a possibility. Get medical assessment instead. A clinician may use an examination, blood testing (D-dimer in appropriate situations), and ultrasound to determine whether a clot is present.
