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1 When blood clots occur in a vein, symptoms may include. 2  pain, 3  swelling, 4  warmth, and. 5  redness. 6  If a forms in a vein in a leg or arm breaks; breaks off and travels to the lung a pulmonary embolus can occur. 7  Symptoms of pulmonary embolism are chest pain and shortness of breath.
Deep vein thrombosis (DVT) occurs when a blood clot forms in one of the deep veins of the body, usually in one of the legs. Signs and symptoms of blood clots related to DVT include swelling, usually in one leg, leg pain or tenderness, reddish or bluish skin discoloration, and the leg might be warm to the touch.