I have trouble breathing out of 1 nostril. whenever i put my finger in that nostril a feel a big hump. what is this?

Get it checked: You should be seen by a physician/healthcare provider and have them look up into your nose with light and magnificent. What you are feeling may be a nasal polyp. Whatever it is, you need to know. It can probably taken care of fairly easily so that you can breath out of both nostrils again.

Needs evaluation: Could be a nasal polyp, cyst, or other growth. Also could be an anatomical issue like a deviated septum. Most rhinitis symptoms are bilateral, not one-sided. Likely requires further workup by either and allergist or ENT specialist to determine cause.