I took the definition from Wikipedia. Pain is a kind of feeling that arises as a result of strong irritations of the nervous system.
In fact, pain is a certain signal of the nervous system that something has gone wrong. Quite often, pain is our helper, because it helps to diagnose certain diseases.
Abroad, there is a specialty of Pain Management Doctors and entire clinics whose activities are aimed at combating pain:
No one should suffer from pain, but swallowing the painkillers available in the first-aid kit without control and sometimes in unlimited quantities (because it does not help) is also not an option.
The treatment must be correct.