Seasickness is a feeling that some people get when they're on a boat or ship. It's when your tummy feels upset and you might feel like you need to throw up.
When you're on a boat, it can move up and down or side to side because of the waves in the water. Your body might not be used to this motion, which can make you feel sick.
Your tummy, ears, and eyes all work together to help keep you balanced. When you're on the boat, these parts of your body can get confused because of the movement. Your eyes might see one thing, but your tummy feels something different.
Some people are more likely to get seasick than others. If you're worried about getting seasick, you can try sitting in the middle of the boat where it's less bumpy or looking out at the horizon. Some people find that eating snacks like crackers can help too.
If you do start to feel seasick, it's important to tell an adult. They might have medicine or other ways to help you feel better. It's also a good idea to take deep breaths and try to relax. Remember, feeling seasick is normal for some people, and it usually goes away once you're back on land!