Okay, imagine you are playing outside on a really hot day and you fall down and hurt your arm. Your arm starts to feel really sore and swollen. What do you do?
Well, one thing you could do is put some ice on your arm. This is kind of like what hilotherapy is.
When you hurt yourself, like by twisting your ankle or hurting your knee, your body sends a lot of blood to that area to help it heal. This blood makes the area swell up and feel very warm.
Hilotherapy means using something very cold, like ice or a special kind of gel, to help reduce the swelling and make the area feel better.
Doctors might use hilotherapy on someone who just had surgery to help reduce the pain and swelling. They might also use it on athletes who got hurt while playing a game.
So, that's hilotherapy! It's like putting ice on your boo-boo to help make it feel better.