What is the principle of anesthesia?

Under normal circumstances, anesthesia involves the use of drugs or other methods to temporarily induce loss of sensation—either overall or in a specific part of the body—to achieve painlessness and facilitate surgical treatment or other medical procedures. A detailed explanation is as follows:

The core principle of anesthesia lies in the action of drugs on the nervous system to block the transmission of pain signals. Pain sensations are detected by nerve endings, transmitted via nerve fibers to the spinal cord, and then relayed upward to the brain where perception occurs. Anesthetic agents can inhibit electrical signal conduction in nerve fibers or act on specific regions of the brain to interfere with signal processing, thereby preventing the body—either locally or entirely—from transmitting pain signals to the brain. These drugs may also suppress consciousness and relax muscles, creating a safe and pain-free environment for medical interventions.

After surgery, patients should rest in a quiet environment, avoiding strong light and noise stimulation. Only after full recovery of consciousness and with the doctor's approval should the patient begin with liquid or semi-liquid foods, gradually transitioning to a regular diet. Vital signs such as respiration and blood pressure should be closely monitored, along with observation of the surgical wound for any bleeding or discharge. If discomforts such as nausea, vomiting, dizziness, or weakness occur, medical staff should be informed promptly. Additionally, assist the patient with appropriate repositioning to prevent pressure ulcers and thrombosis.