Okay, so you know how sometimes when you accidentally touch something really hot or bump your knee on the coffee table it hurts a lot? That's called pain.
But sometimes when people are sick or hurt a lot, they might not feel pain as much as they normally would. This is called hypoalgesia.
It's kind of like when you eat really spicy food, your mouth might get used to it after a while and it doesn't taste as spicy anymore. In the same way, when your body is sick or hurt a lot, it might get used to feeling pain and it doesn't hurt as much anymore.
Hypoalgesia can happen for different reasons, like when your body releases certain chemicals to help you feel less pain. But it's important to remember that sometimes pain is a good thing because it helps us know when something is wrong with our bodies. So, it's always a good idea to tell a grown-up if you're feeling any kind of pain.