Sinusitis is a non-specific inflammation of the mucous membrane of the sinuses, and is a very common polyvalent disease in otorhinolaryngology, generally divided into two categories: acute sinusitis often occurs after a cold with nasal blockage, increased purulent nasal discharge, decreased sense of smell and headache, which can be accompanied by fever and general discomfort. Chronic sinusitis has similar nasal symptoms to acute sinusitis, but no systemic symptoms, and has a long duration, which can be accompanied by headache, memory loss, and inattention, often affecting children and adolescents in their studies. Due to the flow of pus into the pharynx and long-term breathing through the mouth, it is often accompanied by symptoms of chronic pharyngitis, such as sputum, foreign body sensation or pain in the throat. It can also affect the ears, with symptoms such as tinnitus and hearing loss. The causes of sinusitis are many and more complex. Acute sinusitis is mostly caused by acute rhinitis (i.e. cold); chronic sinusitis is often formed when acute sinusitis is not completely cured or recurrent. In addition, allergic reactions, mechanical obstruction (such as nasal polyps, nasal septum deviation) and changes in air pressure can easily induce sinusitis, and infection of the teeth can cause odontogenic maxillary sinusitis. The initial diagnosis is usually made on the basis of symptoms, but anterior rhinoscopy or nasal endoscopy and sinus CT can help clarify the diagnosis. Acute sinusitis can be diagnosed by systemic application of antibiotics and mucus-promoting drugs, as well as intranasal application of vasoconstrictors to reduce the symptoms of nasal congestion and improve sinus drainage. However, the use of decongestants should not be used for more than one week. For those with headache and fever and other systemic symptoms, non-steroidal antipyretic and analgesic drugs should also be given as symptomatic treatment. For maxillary sinus pus accumulation, maxillary sinus puncture should be performed to flush out the pus and inject anti-inflammatory drugs. Chronic sinusitis should be treated with nasal irrigation, glucocorticoids, mucus-promoting drugs, supplemented with Chinese medicine, and allergic rhinitis and dental infections as triggers. If formal treatment is ineffective for a period of time, or if it is clear that irreversible lesions such as nasal polyps or anatomical abnormalities affecting sinus drainage such as deviated nasal septum exist, then nasal endoscopic surgery should be adopted. Patients can prevent chronic sinusitis by strengthening physical exercise, enhancing physical fitness, and preventing colds, while actively treating acute rhinitis (colds) and toothache. Avoid diving and choking when swimming. When suffering from acute rhinitis, it is not advisable to travel by airplane.