Pain is one of the main signs of human life (breathing, pulse, body temperature, blood pressure, etc.). ) is of great biological significance. The significance of acute pain lies in its warning function. More than 50% patients go to see a doctor because of pain, so acute pain is called "good pain". On the contrary, chronic pain that lasts for more than 3 months and is difficult to treat can only destroy physical and mental health and quality of life. This kind of pain is considered as "bad pain" and should be eliminated. This shows how important it is to pay attention to the pain problem.

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