The reality of pain memory (and birth memory) is confirmed by a mother whose premature baby was shunted for hydrocephalus without painkillers and while paralyzed with curare. Large incisions were cut in his scalp, neck, and abdomen and a hole drilled in his skull. She writes that ten years after the operation her son will still not allow anyone to touch his head, neck, and abdomen in the areas touched during surgery. The mere sight of the hospital provokes in this child violent trembling, profuse sweating, screaming, struggling, and vomiting.
http://www.cirp.org/library/psych/chamberlain/