When you react to pain, worry, anxiety to injury you constrict your tissues even more. At first, this physical and emotional tightening protected you from the worst of the pain. It was useful but as time goes on it creates lasting limits and dullness.
Sensitive people and HSP tend to be very affected by this secondary type of constriction. You are more aware of what is happening than most people but you are also most vulnerable to suffering from that awareness.