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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.
Itâs possible to have a blood clot with no obvious symptoms. When symptoms do appear, some of them are the same as the symptoms of other diseases. Here are the early warning signs and symptoms of a blood clot in the leg or arm, heart, abdomen, brain, and lungs. You should call your doctor immediately if you think you might have a blood clot.