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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.
About Headaches & Congestion From Mold & Mildew. An allergy to mold and mildew causes sinus headaches and nasal congestion. Headaches and congestion from mold and mildew are the result of a mold allergy, according to the Asthma and Allergy Foundation of America. A mold allergy is defined by MayoClinic.com as an overreaction of the immune system to mold spores.