Congenital insensitivity to pain
Congenital insensitivity to pain (CIP), also known as congenital analgesia, is an inability for a person to feel physical pain due to various rare genetic conditions. CIP is caused by genetic mutations that affect the development or function of nociceptors, the sensory neurons responsible for recognizing tissue damage.
Source: Wikipedia — Congenital insensitivity to pain (CC BY-SA 4.0)