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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.
The congestion of blood and the swelling basically mean that the pressure in the veins is higher and that is exerted on the tissue compartments within the leg. This is why symptoms of blood clot in leg include leg pain and tenderness. Cramping. For the same reason that leg pain and tenderness are symptoms of blood clot in leg, cramping can occur.