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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.
Signs and Symptoms of a Blood Clot. There are a variety of causes of blood clots. Signs and symptoms of a blood clot depend on the location, and may include: Blood clot in the leg (DVT): Pain, redness, and swelling in the area around the blood clot Blood clot in the lung (pulmonary embolism): Shortness of breath, chest pain, and rapid pulse and breathing