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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.
Blood clot in the leg or arm. The most common place for a blood clot to occur is in your lower leg, says Akram Alashari, M.D., a trauma surgeon and critical care physician at Grand Strand Regional Medical Center. A blood clot in your leg or arm can have various symptoms, including: 1  swelling. 2  pain. 3  tenderness. a warm sensation.  a pale or bluish discoloration.