Paranoid anxiety is when our brains make us think that something bad is going to happen to us, even if it's not true. It's like feeling scared and worried all the time for no good reason.
Imagine that you're playing in your room and you hear a noise outside. Your brain tells you that it might be a monster, but you know that monsters don't exist. However, if you have paranoid anxiety, you might still be really afraid and think that the noise means a monster is coming to get you.
People with paranoid anxiety can also worry about things that might happen in the future, even if there's no evidence that it will happen. For example, you might worry that your parents are going to get hurt in a car accident even if they're good drivers and have never been in an accident before.
It's important to know that paranoid anxiety can be treated with therapy and medication. Your brain can learn to think differently and not be so afraid all the time.