Nowadays, there are many methods of anesthesia, and the drugs include sedatives, analgesics and muscle relaxants, each of which is different. But the vast majority of them cannot pass through a barrier called the “blood-brain barrier”. The so-called blood-brain barrier is actually a barrier to the structure of the brain capillaries that prevents certain substances from entering the brain tissue from the blood, but of course, most of the substances prevented are harmful. Occasionally, this barrier can create a little trouble, for example, many drugs for neurological diseases are often ineffective because of the blood-brain barrier, giving doctors a headache; but more often, it plays a role in protecting the brain. In the process of using narcotic drugs, the blood-brain barrier also plays its role, so the ingredients of narcotic drugs cannot easily “interfere” with the brain. At the same time, 80% of the narcotic drugs are metabolized by the liver, and some are metabolized by the kidneys, usually in about 30-120 minutes. In addition, some parents may worry about ischemic symptoms during anesthesia, but the hospital will prepare enough plasma for the patient before the surgery to avoid accidents, so there is no need to worry about this. Nowadays, except for minor surgeries such as tongue tie cutting, which is short and risky, most of the children’s surgeries are performed under general anesthesia, including the surgery of wheals, which seems to parents to be “not very moving”. This also makes many parents wonder if the hospital is not a little too big deal. In addition, modern medicine also believes that general anesthesia can avoid unnecessary trauma to the child because of the surgery. If a child is taken away from his parents in a sober state, sent to the operating room alone, and then watch a bunch of unknown doctors “pounding” him with various tools, this itself is a very serious psychological stress event, which may bring long-term psychological trauma to the child, which is also not good for the child’s healthy growth. So let children in the process of general anesthesia, “a sleep to wake up surgery is over”, in fact, for the child is also a protective measure.