Swelling in one leg or arm
Pain or tenderness, often starting in the calf or thigh
Warmth in the affected area
Red or discolored skin
Sudden shortness of breath
Chest pain that may worsen with deep breathing
Rapid heartbeat
Coughing up blood
One-sided leg swelling with pain
Unexplained severe headache
Vision changes
Weakness or numbness on one side of the body
Trouble speaking
Seek urgent medical care immediately if these symptoms occur