User blog comment:SmidgetTheMidget/I'm scared/@comment-25941663-20151221220140

If the nosebleeds/blood in spit persist, you should go to a doctor.

But I doubt it's anything serious. Nose-bleeds rarely mean much. Also, I don't think nose-bleeds and blood in spit are symptoms of the same disease. But because the nose and the mouth are connected (not directly, but still) if your nose starts bleeding, it's not unheard of for some blood (from your bleeding nose) to slip down into your mouth which you will later spit. It has happened to me before.

I'm no doctor though, so if it doesn't go away, visit one.