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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.
Early symptoms of leg blood clot. Severe pain in the area where blood has clotted is one of the obvious symptoms of a leg blood clot, also known as deep vein thrombosis. If the clot is left without being attended to, it can result in it growing larger and larger.