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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.
Swelling. Swelling in one or both legs are symptoms of a blood clot. Swelling that is a symptom of a blood clot in the leg can be sudden or chronic. A blood clot in the leg might produce no symptoms at all unless the clot dislodges and travels to another part of the body and blocks blood flow.