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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.
10 Common Symptoms of a Blood Clot. Blood clots typically form deep within the veins of the legsâdeep vein thrombosis (DVT). However, the scary part is that most times blood clots can go undetected, resulting in pulmonary embolism and death when leg clots break free and lodge in the lungs. 1. Exhaustion or unexplained fatigue.