7 doctors weighed in:

What can cause bad breath and yellow nasal discharge?

7 doctors weighed in
Dr. Jonathan Adler
Ophthalmology
6 doctors agree

In brief: Sinus infections

The yellow discharge id due to bacteria, usually h, influenza, staph, or strep.
The bad breath can be from postnasal drip and the bacteria which smells getting to your throat.

In brief: Sinus infections

The yellow discharge id due to bacteria, usually h, influenza, staph, or strep.
The bad breath can be from postnasal drip and the bacteria which smells getting to your throat.
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