Left-sided basal ganglia hemorrhage may lead to brain hernia formation. If the amount of left basal ganglia hemorrhage is less than 30ml, the patient’s condition is relatively stable, and can be treated with drugs to lower the cranial pressure and promote the metabolism of brain cells, but at the same time, we should pay attention to the observation of the patient’s vital signs, including blood pressure, body temperature, pulse and respiration. If the left basal ganglia hemorrhage is greater than 30ml, it will cause swelling of brain tissue, obvious compression, increased intracranial pressure, and displacement of brain tissue, leading to the formation of brain hernia, and in severe cases, even leading to the death of the patient. Once the brain hernia is formed, there may be damage to the brain tissue and brain nerves, which will lead to limb hemiplegia, speech dysfunction, etc., and the brain cells are non-renewable and difficult to be restored. Patients with cerebral hemorrhage should go to the hospital in time, identify the cause and then actively cooperate with the doctor’s treatment, if necessary, craniotomy for hematoma removal, and rehabilitation should be carried out as soon as possible after the operation.