Look for one-sided leg swelling
Check for pain or tenderness, especially in the calf
Notice warmth in the affected leg
Watch for redness or discoloration
Compare both legs for size differences
Check for tightness or heaviness in the leg
See if pain worsens when standing or walking
Watch for sudden shortness of breath
Watch for chest pain
Watch for coughing up blood
Seek urgent medical care if you suspect a blood clot