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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.
1 You have signs of a blood clot, such as: 2  Pain in your calf, back of the knee, thigh, or groin. 3  Redness and swelling in your leg or groin. 4  You have signs of infection, such as: 5  Increased pain, swelling, warmth, or redness. 6  Red streaks leading from the sore area. 7  Pus draining from a place on your leg.