A sort of corrollary to this is CIPA

https://www.verywellhealth.com/cipa-disease-when-a-person-can-t-feel-pain-4122549

You just do not feel pain, cannot sense temperature and never sweat.

You also, as a child more often, frequently seriously injure yourself and do not even realize it.

Also the inability to sweat makes you much, much more susceptible to heat stroke.