Physical pain is important to keep the integrity of this body together.Our human body is a super intelligence machine and has all the necessary mechanism to keep itself intact in one piece. One smart quality of this physical body is 'pain'.
Whenever we get hurt we immediately try to heal it using some medication and also remember the way and thing we got hurt with and try to avoid such painful encounter again. We have this memory in our body that if we fall down we will get hurt so we always try to balance ourselves and also walk or run cautiously.
If there was no pain in body then we might cut our bodies from so many places and become totally insensitive towards it. We don't mind cutting our hair into so many styles because there is no pain. If we had no pain then we will first of all cut our stomach tyre and become slim, but the pain of this body prevents us from doing so.
What do you think you would do if, there was no pain in your body?