Patients can self-test whether there are sensory disorders, motor nerve disorders, mental disorders and other aspects to determine whether the cerebral blood supply is insufficient, but the accuracy of the self-test results is poor, and it is necessary to standardize the diagnosis of medical treatment. 1. Sensory disorders: If the blood supply to the brain is insufficient, the brain nerve tissues will be affected, and the patient can measure whether there are symptoms such as blurred vision, dizziness, tinnitus and so on. 2. Motor nerve disorders: If the blood supply to the brain is insufficient, motor nerve disorders may occur, and the patient can test himself to see if there are uncoordinated limbs, weakness of limbs, and falling down when walking. 3. Mental disorders: If the blood supply to the brain is insufficient, patients may have mental disorders, and patients can test themselves to see if they have drowsiness, insomnia, depression, anxiety, and so on. Due to the differences in the physical condition of each patient, so can not be generalized, it is recommended that patients go to the hospital for relevant examinations to find the cause of the disease and then symptomatic treatment, do not use unscientific methods, so as not to cause aggravation of the condition.