CIPA. It's when a person does not have the ability to feel pain or temperature. Although it has its negative effects because pain helps any living creature survive. It also has helpful effects.
For example: not being able to feel pain takes away almost any fears a person may have. It also grants a person immunity to torture. You could potentially have a mentally and physically unbreakable superhuman at the cost of not knowing how much damage you have taken until you visit a doctor.