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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.
If you have recently had a blood clot in a leg or arm, you may experience: 1  Swelling of the affected leg or arm. 2  Leg pain or tenderness that may only occur when you are standing or walking. 3  Increased warmth in the swollen or painful area of the affected leg or arm.  Redness or discoloration of your skin.