What causes posterior nose bleeds?

Answer 1

I agree with the above answer by huggz... and would just like to add that relative humidity could have a contributing factor. I'm not sure if you live in dry conditions... but ideal relative humidity would be about 40% (ideal for comfort). If the humidity drops below that, say in the 20's and 30's, you'd notice your skin would be dry... and with it, your nasal cavities would be dry. This would contribute to posterior nose bleeds.

Another factor you might want to look at is clotting factor. Are your platelets low? Are you taking aspirin on a regular basis? These are also things that may contribute to bleeding (or lack of clotting).

Have you seen an ENT (Otolaryngologist) for your problems? (Ears, Nose, Throat Physician). This question isn't quite up my alley, but you could probably find an ENT with better suggestions. Perhaps moistening your nasal cavities with normal saline every so often would help with the dryness (if this is the cause). You can buy it anywhere, pharmacies have it in bottles for diluting medicines. They even come in pink disposable plastic containers (bullets). Just wet your nostrils with the saline and let it dribble out. Blowing it out may make you bleed. You may also use the special gels... but be sure not to use petroleum based gels (vaseline) as you may get lipoid pneumonia if you accidentally suck some into your lungs.

Good luck.

Answer 2

Most commonly its due to the blood vessels being more fragile (and easily breakable) than they should be.