Sinusitis can be divided into acute sinusitis and chronic sinusitis, and its onset is related to pathogenic bacterial infection, abnormal nasal structure, infection of neighboring organs, and is generally not infectious. The main symptoms are nasal congestion, pus flow, decreased sense of smell and pain in the cheeks. 1. Acute sinusitis: most of them are secondary to upper respiratory tract infection or acute rhinitis, which is an acute catarrhal or purulent inflammation of nasal mucosa, and the causative organisms are mostly purulent cocci, which are not infectious. 2. Chronic sinusitis: acute sinusitis can be repeated episodes, the condition of the evolution of the delay, or due to the nasal cavity structural abnormalities, such as deviated septum and other triggers, but also due to the neighboring organs, such as teeth and other parts of the infection secondary to the emergence of dental sinusitis for anaerobic infection, these factors also do not have infectious. Sinusitis is not contagious, it is recommended to actively follow the doctor’s instructions for treatment.