Hypoglycemia is often seen in hypoglycemia, hyperglycemia, cerebral atherosclerosis, cerebral infarction, dementia, etc. Patients with hypoglycemia are often accompanied by sweating and hunger, and the symptoms can disappear quickly after eating or supplementing glucose. Patients with hypoglycemia should usually eat regularly and adjust the dosage of hypoglycemic drugs when necessary if they apply hypoglycemic drugs. Hyperglycemia is mainly seen in people with poor glycemic control of diabetes, and there are two conditions: diabetic hyperosmolar coma and diabetic ketoacidosis, in which the patient’s measured blood glucose is significantly higher than the normal range. Patients with cerebral arteriosclerosis often have a past history of hypertension, hyperlipidemia and hyperglycemia, and the cerebral arteriosclerosis vascular lumen is narrowed and causes insufficient blood supply to the brain, resulting in disorientation. Patients with cerebral infarction have an acute onset, often accompanied by limb weakness, sensory impairment, choking and coughing, swallowing difficulties, etc. Dementia is a common disease in the elderly, and the common ones are Alzheimer’s disease and vascular dementia.