'Teachers don't notice you have it... they think you're naughty'
For some children in the UK going to school can be really difficult.
The mental health charity Mind wants more to be done to help children who have what’s known as school phobia, - or school refusal - so they're not treated as truants. That's when a child misses school when they're not allowed to.
Ricky's been talking to 14-year-old Kai.