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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.
How to tell if you might have a blood clot. Signs to look out for after your operation include: pain or swelling in your leg. the skin of your leg feeling hot or discoloured. the veins near the surface of your leg appearing larger than normal.