Homeless kids are bullied and get ill more, says a new report.
The charity Shelter said children who have no real home and have to stay in hostels or shelters have trouble at school.
They're picked on by other kids for having no friends and for trying to fit it when they keep moving schools.
Can't keep up
Lots of them miss school altogether and fall behind because they can't do their homework.
And they often live in cramped places which aren't clean enough and don't have proper cooking equipment.
That means children having bad diets and getting ill.
About 100,000 children were homeless last year and a third of kids in the UK live in families without enough money.