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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.
Blood clot symptoms transpire in affected lower extremities, such as the legs and feet, when this condition restricts the flow of blood within the vein, resulting in inflammation and swelling. Typical symptoms of deep vein thrombosis include: Discoloration of the skin. Increased leg pain when extending the foot.