Okay kiddo, so sometimes people are born with something called familial dysautonomia. This means that their body doesn't work the way it's supposed to.
You know how when you get hot or cold your body automatically tries to fix it by sweating or shivering? Well, in people with familial dysautonomia, their body doesn't always do those things when it should. It's like the messages between their brain and body are mixed up.
This can cause problems like trouble with digestion, low blood pressure, and trouble feeling pain. People with familial dysautonomia might also have a hard time coordinating their movements and may get dizzy or faint easily.
It's important for people with familial dysautonomia to get lots of help from doctors and take extra care of themselves to stay as healthy as possible. But like all people, they can still do lots of things and live happy lives with the help and support of their family and friends.