Could post nasal drip cause a foul odor when you smell?

Yes, post nasal drip can cause a foul odor when you smell. This is because the mucus that drips down the back of your throat can collect bacteria and other debris, which can then produce an unpleasant smell. This smell can be especially noticeable when you breathe in through your nose, as the air passes over the back of your throat and picks up the odor. Post nasal drip can also cause other symptoms, such as a sore throat, hoarseness, and a feeling of something stuck in your throat. If you have any of these symptoms, it is important to see a doctor to rule out any underlying medical conditions.