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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.
Venous clots typically form slowly over a period of. time. Symptoms of venous clots gradually become more noticeable. Blood clots can occur in many different parts of the body, each area having different symptoms: Legs and arms: Symptoms of blood clots in the legs and arms vary and may include pain or. Blood Clots Page 1 of 3. CopyrightÂ© 2016, RadiologyInfo.org Reviewed: Apr-11-2016.