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The most common reason for a foul odor coming from the nose is an infection in one or more of the sinus cavities. I would speak to your physician about this. A CT of the sinuses will be the most effective way to make this diagnosis. Unfortunately, a physical examination cannot do this.
Here are some of the causes that can lead to smelly mucus. Sinusitis: There are four pairs of para-nasal sinuses located in the skull bone. They are in the cheekbone, behind the eyes, under the forehead, and near the nasal bridge. Normally the sinuses warm and clean the air that a person breathes.