Anesthetics can paralyze the central nervous system during surgery, sedate the patient, reduce consciousness, and diminish pain. In general, there is no greater harm to the body, but sometimes there are inevitably some hazards and complications: 1, nausea and vomiting: patients are prone to nausea and vomiting after general anesthesia; 2, induced heart disease: patients with heart disease are prone to heart attack under the action of anesthetics; 3, misaspiration or aspiration pneumonia: patients under general anesthesia are prone to esophageal reflux, which leads to misaspiration or Inhalation pneumonia; 4, delayed awakening: if the general anesthesia patients are elderly and have systemic metabolic diseases, prone to delayed awakening symptoms; 5, allergies: if the patient is allergic to external anesthetics will also be harmful to the body, but the probability of this situation is very small; 6, life-threatening: anesthetics are used according to the patient’s kilogram weight, if the anesthetic inhalation overdose, there may be respiratory depression, slowdown, or even cardiac If the anesthesia drug is inhaled too much, there may be symptoms such as respiratory depression, slowdown, or even cardiac arrest, which may endanger life. In general, the standardized use of anesthetic drugs, as long as the concentration and dose of anesthetic drugs within the safe range, or timely treatment when complications are found, is generally not harmful to the body.