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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.
Your risk of a blood clot can also be increased if you smoke or are overweight. Symptoms of having a blood clot include skin redness, swelling in only one leg, swelling or bruising behind the knee, localized soreness or pain, or having a warm spot on your leg. If the clot moves to the lungs you may experience shortness of breath, chest pains, a fast heartbeat, mild fever, or fainting spells.