There will be a pain change process after the closure, pain at the time of injection, followed by about 20-30 minutes without pain, and then the pain gradually recovered, about 8-20 hours of the most painful, and then gradually relieved; the reason for such a change in the curve of the pain is that just after the injection of local tissues were separated, instantaneous pain, but anesthesia quickly blocked the nerve conduction, and no longer in pain, but the gradual absorption of the local anesthetic after the recovery of pain, and because of the separation of tissues and the effect of the most painful, in the hormone gradually play a role in the pain can be relieved!