Booger crusts usually refers to the nasal cavity in the process of airflow through the water with the airflow evaporation of nasal secretions left behind by the dry knot, the nose always have booger crusts may be suffering from atrophic rhinitis, chronic sinusitis, nasal cavity swelling and other diseases lead to. 1. Atrophic rhinitis: a chronic atrophy or degenerative changes in the nasal mucosa of the chronic inflammatory lesions of the nasal mucosa, often triggered by nosebleeds, nasal dryness and other manifestations, often containing purulent crusts and nasal odor. 2. Chronic sinusitis: a chronic inflammatory disease of the sinus mucosa, sinus secretions can flow into the nasal cavity, forming the so-called boogers. 3. Nasal swelling: such as nasal polyps, etc., can be secreted, can be mixed with external bacteria, viruses, dust and the formation of booger crusts. It is recommended that patients consult a doctor in time to check the nose to clarify the cause of booger crusts and treat the cause.