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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) Symptoms and Signs. Symptoms of a blood clot in the leg (deep vein thrombosis or DVT) occurs when a clot clogs the blood flow in a vein, causing inflammation. Examples of symptoms and signs of a DVT in a leg are: 1  Swelling.  A gradual onset of pain.