When I was little I sometimes would v* from a post nasal drip. Not every time I had a cold, but occasionally. And usually I would start to feel better a couple hours afterward. I'm pretty sure I've out grown it (knock wood), but the mucus can irritate the stomach and cause v*ing in children or senstive people. Your sister is a teenager so she probably has adult level control over v*ing, so maybe she's just sensitive.

Although, what you said about her eating sausage and eggs. Yikes! My stomach doesn't like stuff like that even when I'm healthy so I can't imagine eating it with a cold, v*ing or no.

Edited by: chicajojobe