The side effects of general anesthesia in the elderly may occur in the respiratory system, nervous system, cardiovascular system and so on. 1. Respiratory system: most of the lungs of the elderly will have degenerative changes, as general anesthesia may require tracheal intubation, there will be some damage to the airway of the elderly, which may lead to sore throat, laryngeal edema, etc., and the occurrence of aspiration pneumonia. 2. Nervous system: usually the nervous system of the elderly is more sensitive, and cognitive impairment and memory loss may occur after general anesthesia. 3. Cardiovascular system: anesthesia drugs have a certain inhibitory effect on the cardiovascular system, if the elderly themselves suffer from cardiovascular diseases, such as hypertension, coronary heart disease, etc., after general anesthesia, it may lead to myocardial infarction, arrhythmia and other side effects. If the elderly need to undergo general anesthesia surgery, they should consult regular hospitals and do a good preoperative examination and assessment to reduce the incidence of side effects.