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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.
This is a medical emergency and may cause death. Symptoms of a blood clot include: Leg swelling (edema) Leg pain or tenderness. Leg redness. If you have these symptoms, call your healthcare provider. You may also have a D-dimer test if you have symptoms of a blood clot in the lungs, such as: Trouble breathing. Coughing (may cough up blood)