Drowsiness in the elderly may be caused by the following eight dangerous signs: 1. To be considered a precursor of cerebrovascular disease, if the patient has unexplained drowsiness and drowsiness, it means that the brain is in a state of lack of oxygen, probably because of the extremely slow cerebral blood flow, or because of cerebral vascular stenosis and other causes leading to cerebral ischemia, it is likely to occur the problem of cerebral infarction, to be treated in a timely manner. 2. This means that the brain is seriously deprived of oxygen, probably because of staying up late, poor sleep, mental sleepiness and depression. 3, if the patient has diabetes and suddenly has problems with drowsiness, consider the performance of diabetic ketoacidosis. 4, if the patient suddenly has problems with drowsiness, it may be the case of improperly controlled blood pressure, caused by elevated blood pressure fluctuations, it is recommended to measure blood pressure clearly. 6, to pay attention to the elderly Whether it is due to too much obesity. 7, sleep apnea problems caused by. 8, to consider may be due to heart problems.