Sudden swelling in one leg
Pain or tenderness in the calf or thigh
Warmth in the affected area
Red or discolored skin
Leg cramps that do not go away
Pain that worsens when standing or walking
One leg appearing larger than the other
A firm or tender vein under the skin
Call emergency services immediately if you have chest pain, shortness of breath, coughing up blood, or a rapid heartbeat
Seek urgent medical care if you suspect a blood clot in the leg