Any infection or blockage in your nose can cause you to smell something that is not there. This blockage could further cause problems with breathing. Your symptoms of bad foul smell in the nose could be due to sinus infections. They are due to stasis and infection of the sinus cavities, and the resultant drainage into the nose causes the bad smell. Facial pain, fever and nasal discharge are the other symptoms of sinusitis.
It can also be caused by temporal lobe seizures, sinusitis, brain tumors, migraine, Parkinson's disease and stroke. You will need to consult your primary care physician for proper assessment. In the meantime practice good breathing exercises, humidify your room and do steam inhalations.
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