Pain Genes and Perception

Many researchers have found a gene mutation in people that have the ability to abolish pain or cause permanent agony. This raised many questions to whether if people have different genes that can tolerate different levels of pain. Paul Waters and Steven Pete from the UK and U.S. both suffer from congenital insensitivity to pain since birth. They both were brought together to conducts research in this rare disorder. They found that in order to feel pain, nociceptors fire signals to the spinal cord sending it to the brain. They also found that people who complain more when they are injured have a crop of gene variations in their genomes.  

 http://www.thenakedscientists.com/HTML/articles/article/pain-genes-and-perception/