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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.
Talk to your doctor immediately to prevent further damage. -A blood clot: Swelling is usually the first sign of a blood clot, followed by the leg feeling hot or cold, pain, lack of feeling, tingling, or a numb sensation. Call your doctor immediately if you suspect a blood clot.