If someone in your family goes through life barely noticing burns, cuts, or fractures — or, at the other extreme, struggles with unstable blood pressure, poor temperature control, and unexplained vomiting episodes — you already know that "peripheral neuropathy" as a label doesn't capture what's happening.

Most people who search for information on congenital insensitivity to pain are not doing so out of curiosity. They are parents who just watched a toddler chew through a lip without crying, or adults who noticed a family pattern of unexplained fractures, or clinicians trying to make sense of a case that does not fit the usual textbook categories.