what would cause a person to have a foul odor coming from their nose?

This is caused by an accumulation of infected mucous in your sinuses. My husband had the same thing. Sometimes the odor was so bad, I couldn't stand next to him. Antibiotics didn't help, because by the time it gets this bad, it needs to be suctioned out. Go see a Ear, Nose and Throat Specialist.

Sinus discharge can often cause this.

If it is infection, the RIGHT kind of antibiotic should be used.

Drink lots and lots of water and keep nose clean. Use Bactricin on it three times a day. (Wipe a little on the edges with a q-tip)

Sometimes you can get a sinus infection that is resistent to treatment.

You could also have a nasal polyp that could come and go, and when it becomes stagnent it could stink.

In a little kid, you are always thinking foreign bodies being shoved up the nose, especially tic tacs.

Have an ENT see your friend.

might be infection. it caused through sinus. bath with hot water only. rather 5-8 deg more than body temp.

dont take any cold things. breath steam if it is possible for 2-3 minutes. try thins for 15 20 days

I was going to say sinus infection but antibiotics should have taken care of it. Seek advice from your Dr. Good luck

Possibly a mold or other fungal infection that is provoked by the natural cyclic changes in body chemistry. Or it could be debris lodged in there.

Could be a cyst located in the upper part of your breathing passage...consult a DR. ASAP

my kids went thru that phase. one stuffed a piece of sponge up their nose - smelled bad.

another one jammed a piece of BBQ pork in their booger hole - it smelled like something died... nasty.

but those didn't come and go - until the doctor pulled them out.

He is a brown noser

Sometimes tonsil stones can cause this also.