There's something called the physiology of forgiveness. Being unable to forgive other people's faults is harmful to one's health.
Herbert BensonStress does not cause pain, but it can exacerbate it and make it worse. Much of chronic pain is 'remembered' pain. It's the constant firing of brain cells leading to a memory of pain that lasts, even though the bodily symptoms causing the pain are no longer there. The pain is residing because of the neurological connections in the brain itself.
Herbert Benson