It’s reported about pain if you chronically have in your body. According to this report the pain is memorized in your brain and suspended in the neurotransmitter.
Actually we feel pain when it gets hurt or damaged by the sickness or the accidents. Even if it’s recovered our memory still remains pain afterward to prevent the next disaster.
I think it’s good suggestion to know the CD4 (Comfortable direction 4) and start from the painless physical exercises to forget pains.