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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.
1 You can have DVT and not know it, especially if the clot is small. 2  The most common symptoms of DVT are swelling in an arm or leg, tenderness that isn't from an injury, and skin that feels warm and is red in the area of the clot.  A clot usually forms in just one leg or arm, not both.