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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.
A blood clot in the leg, call Deep Vein Thrombosis, causes the following symptoms. Swelling, gradual onset of pain, redness, warmth to the touch, leg pain worsens when bending the foot, leg cramps (especially at night), bluish or whitish discoloration of the skin. However, 30-50% of individuals do not experience symptoms.