Cerebral ischemia is the reduction of local blood supply to the brain, resulting in brain dysfunction, and ischemia in different parts of the brain. Its performance are different. The main manifestations include: 1) dizziness and headache, because insufficient blood supply to the brain leads to dizziness and headache; 2) it can cause brain dysfunction, such as memory loss, forgetfulness, slower reaction, not as sensitive as before; 3) changes in personality, previously more active and outgoing, now do not like to speak, do not like to communicate; 4) in severe cases, hemiplegia, numbness, coma can occur, which has a relationship with the degree of cerebral ischemia.