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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.
Signs of a Serious Sinus Infection. A sinus infection or sinusitis occurs when the air-filled cavities in the nose become inflamed. This infection can be caused by pollutants or irritants in the air, exposure to a virus or bacteria, or from overuse of nasal sprays. There are four pairs of sinuses.