One year after the cerebral infarction, the hamstring bulges up and hurts, which may be related to high muscle tone, or it may be caused by hypocalcemia, local cold and other reasons. 1. high muscle tone: after cerebral infarction, if the patient has the sequelae of paraplegia, and fails to pay attention to good rehabilitation exercise, resulting in the affected side of the limbs for a long time inactivity, high muscle tone, resulting in the hamstring bulging pain symptoms. 2. Hypocalcemia: cerebral infarction is mostly seen in the elderly, and insufficient intake of calcium-containing food after cerebral infarction can lead to hypocalcemia, which can lead to the symptoms of leg cramps and pain. 3. Local cold: after cerebral infarction, the paralyzed side of the limb sensory disorder, cold stimulation can appear hamstring bulging pain symptoms. After a year of cerebral infarction hamstring bulging pain, may also be caused by other reasons, should seek medical treatment as soon as possible, after the cause is clear, by the doctor’s guidance for treatment.