Scabbing builds up and makes you want to scratch even more. This is how the viruses, bacteria, and fungi that are under your fingernails get into your bloodstream and make you sick.
Nose bleeds can be very severe because there are five arteries that run through the lower part of the nose! The sensitive mucous membrane in the nose can take several weeks to heal properly.
Who would have thought that such a harmless habit could be so bad for our health? So the next time you get the urge to do some booger mining, it might be better to reach for a tissue and blow your nose instead.