Hereditary sensory and autonomic neuropathy (HSAN) is a big name for a health problem that some people are born with. It means that the nerves in their body don't work the way they should. Nerves are like tiny wires that run all over your body. They send messages from your brain to your arms, legs, and organs.
But for some people with HSAN, those wires don't send messages the right way. They don't always know when they are hurt or they might not feel hot or cold temperatures like other people. They might also have trouble with their digestion and their heart rate because the nerves that control those things don't work right either.
HSAN can be caused by different things, but it means that some people have to be extra careful about taking care of their bodies. They might need to wear special shoes to protect their feet or use a thermometer to check the temperature of bathwater. They might also need special medicine to help their nerves work better.
It's important for people with HSAN to talk to their doctors about how to stay safe and healthy. And it's important for all of us to be kind and understanding to people who might have health problems that we don't understand.