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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.
What are the signs and symptoms of DVT (deep vein thrombosis)? Signs and symptoms of DVT or deep vein thrombosis occur in the affected leg when a clot obstructs blood flow and causes inflammation. Some people with deep vein thrombosis do not experience any symptoms.