What health problems would make a child too ill to travel?

I'm writing a short story.


I need to know what a child could have that would make her too ill to travel to another country, so I need a health problem that would be quite significant, and possibly something that lasted for a number of months (in fact, something that rendered her unable to travel for years would be even better, if such a health problem exists).





Please help, I really want my story to be authentic. Does anyone have any ideas?





Thanks so much.|||Hey 'CR' cancer can prevent you from traveling like if you constantly have to check in with your doctor, take medicine, be treated or get blood transfusions. Also if a person has like a fake heart or needs to be on a ventilator, that cold keep them from traveling.





Thanks, I hope you look into these and I hope i helped!