In fact, Guan Yu was poisoned by aconite, which is valuable but toxic, depending on how you use it. As a medicine, Aconitum can be used as an analgesic and can also drive away cold. However, Aconitum usually needs to be used in combination with other drugs. If it is used alone, it is very toxic, so care must be taken.

As a poison, aconite poisoning is generally caused by taking too much, taking raw medicine or improper collocation. The toxicity of Aconitum kusnezoffii is the biggest. If taken in excess, it will be fatal. The symptoms of Aconitum kusnezoffii poisoning are numbness, dizziness, tinnitus, pallor, diarrhea and abdominal pain.

Seeing this, I seem to understand why Guan Yu doesn't need to use anesthetic to scrape bones, because the poison has made his arms numb, so he doesn't need Hua Tuo's hemp boiling powder. It seems that Guan Yu doesn't mean that he is not afraid of pain. In the Romance of the Three Kingdoms, the poison arrow in Guan Yu used the medicine of aconite, which was called "the length of a hundred medicines" in ancient times.

Because aconite is highly toxic, it was widely used in medicine in the early days. Of course, if used properly, Aconitum will also have different effects. According to ancient records, Aconitum will also be used as a stimulant and an aphrodisiac, but the specific formula is not clear, but if this medicine is eaten too much, it will definitely have side effects and harm to the human body. At that time, Guan Yu fought in the battlefield all the year round, so his physical fitness would be better than that of the average person. If he were someone else, his arm might be wasted and his life would be endangered. Although Hua tuo didn't have an antidote, he was able to save Guan Yu's arm by surgery, which was a great achievement.