Why would someone cry whenever they read?

I know someone who’s like this. They’ll try to read, usually a book, and start to tear up. They tell me they can’t keep story in their head, and when they start to their eyes get blurry with tears and then they can’t make out the words. (I’ve known them growing up, and they use to read all the time until recently.)

I don’t have any more than that, because that’s all they’ve told me. But can someone help explain this to me? Or try to? I don’t understand it.

Thanks