What medical condition is this? And is it life threatening?

Question

There are a few kids at school where they have this medical condition, where they just faint all of the sudden. It happened today a girl was just sitting, told the girl next to her she felt really sick and collapsed. The teacher acted very serious. It took her about 30 secconds to come back and when she did she sat up all of the sudden and said "Oh My God". there are other kids with this condition and I was just wondering if it was serious and what it was called.

Answer 1

It is life threatening if you are in or on a vehicle when it happens.