No snot but nasal congestion may be due to atrophic rhinitis, deviated nasal septum, adenoid hypertrophy and other factors. 1. Atrophic rhinitis: the nasal cavity is blocked by pus crusts, air can not pass, or because of the atrophy of the nasal mucosa, nerve sensory retardation, although there is air through, but can not be detected. 2. deviated septum: the most common symptom of deviated septum, mostly persistent nasal congestion. c-shaped deviation or cristae cause ipsilateral nasal congestion. C-shaped deviation or crural cause ipsilateral nasal congestion, and the opposite side of the inferior turbinate compensatory hypertrophy, can also appear bilateral nasal congestion, S-shaped deviation is mostly bilateral nasal congestion. 3. Adenoid hypertrophy: this disease is related to the recurrence of acute and chronic nasopharyngitis, after the disease will appear symptoms of nasal congestion, usually no runny nose, but combined with rhinitis and other diseases may appear symptoms of runny nose. The absence of nasal discharge but nasal congestion may be caused by other reasons, it is recommended to consult the doctor in time for systematic examination and clear diagnosis.