Nose has been blocked flow yellow snot very smelly may be related to sinusitis, atrophic rhinitis, nasal foreign body with infection and other reasons. 1. Sinusitis: sinusitis due to sinus sinus obstruction or inflammatory swelling of the nasal sinus mucosa, nasal congestion symptoms, bacterial infections leading to yellow secretions; patients with special infections, such as anaerobic infections or mycobacterial infections, there will be a significant odor, they are sinusitis, a typical symptom. 2. Atrophic rhinitis: atrophic rhinitis due to atrophy of nasal mucosa, nasal gland secretion is reduced, the odorous nose bacillus infection can be yellow crusts, at this time there will be a yellow thick material in the nose, other people smell snot some foul odor, and at the same time, self-awareness of nasal congestion. 3. Nasal foreign body with infection: when there is a foreign body in the nasal cavity, there will be nasal congestion, runny nose and other symptoms, secondary bacterial infection can be yellow runny nose and the phenomenon of nasal odor. When you find that your nose has been blocked with yellow snot and stinky symptoms, you should go to the regular hospital in time to get a clear diagnosis.