Sinusitis is a non-specific inflammation of the mucous membrane of the sinuses, and is a common rhinological complication. Acute purulent sinusitis is mostly secondary to acute rhinitis and is characterized by nasal congestion, profuse pus and headache; chronic purulent sinusitis is often secondary to acute purulent sinusitis and is characterized by profuse pus and can be accompanied by varying degrees of nasal congestion, headache and olfactory disturbance. There is a fundamental difference between acute sinusitis and chronic sinusitis, but they are related to each other. According to international nomenclature principles, we can define acute sinusitis and chronic sinusitis. Acute sinusitis can be defined chronologically as the persistence of sinusitis symptoms, such as headache, nasal congestion, and purulent nasal discharge, within 8 weeks in adults and no more than 12 weeks in children. If the symptoms of a cold persist for 7-10 days after a viral national bacterial upper respiratory tract infection, which is often referred to as a cold, it usually means that a sinus infection may have been triggered. After an acute sinus infection, it is completely curable with systematic treatment with medication and does not leave significant mucosal damage. The spectrum of chronic sinusitis includes recurrent acute sinusitis and chronic sinusitis. The clinical and radiological criteria for chronic sinusitis in adults are: symptoms and signs lasting 8 weeks or recurrent acute sinusitis with 4 episodes per year, each lasting at least 10 days; no acute infection after 4 weeks of drug treatment, but persistent CT abnormalities. The corresponding criteria for children are: signs and symptoms lasting 12 weeks or recurrent acute sinusitis with 6 episodes per year, each lasting at least 10 days; no acute infection after 4 weeks of medication, but persistent CT abnormalities. As seen above, there is a difference between acute and chronic sinusitis; acute sinusitis is usually caused by a cold, while chronic sinusitis is followed by recurrent sinusitis episodes with persistent sinus symptoms. Generally speaking, acute sinusitis can be treated with medication, but it must be used and continued, the latter for at least 4-6 weeks.