My girlfriend started bleeding from her nose and mouth today out of the blue. it lasted between 20-25 minutss. do you know why this happened?

Nose bleed: A nose bleed can cause drainage into the throat which is likely what she is experiencing. If it stopped within 25 minutes it is most likely a normal nose bleed-anterior, and I would not be concened. If she has excessive bruising, bleeding from the gums, then some bloodwork is warranted.

Many possible: reasons but most are benign.Get checked if keeps happening.Go sooner if nose is hurting or has redness.