Chronic sinusitis: a. Etiology: chronic sinusitis is mostly secondary to acute sinusitis. The main symptoms are as follows: 1, nasal congestion: bilateral nasal congestion is often persistent or alternating episodes, alleviated after exercise. 2, pus: specialist examination, the nasal mucosa is seen to be congested and swollen, obvious in the inferior turbinates; mucous pus or pus is most abundant at the openings of the infected sinuses. 3.Headache: often manifested as dull pain or boring pain in the forehead, orbit, deep part of the eye and cheek. 4.Loss of smell: Temporary loss of smell or loss of sense of smell can be caused by nasal congestion. 5, systemic symptoms: Acute sinusitis can appear systemic symptoms of toxicity, such as chills, high fever, loss of appetite, memory loss, general discomfort, etc.. Chronic sinusitis, the systemic symptoms vary in severity, and can be manifested as mental discomfort, lethargy, dizziness, inattention, etc. If pus swallowed too much or nausea, vomiting, diarrhea. Treatment: If conservative treatment is ineffective, surgical treatment should be performed. 1, sinus endoscopic surgery: that is, the use of optical fiber imaging, has the characteristics of intuitive and clear, accurate, high light guide rate, with special surgical instruments, so that the surgeon can directly see almost the whole picture of the sinuses, significantly improve the accuracy of surgery, less damage, targeted, lesion removal thoroughly, fewer complications, good prognosis, recurrence rate significantly reduced. Not only sinusitis, but also many nasal tumors can be treated with this surgical method, which has gradually become popular in recent years and has led to a near fundamental change in rhinologic surgery. Sinus endoscopic surgery requires hospitalization. 2.Auxiliary surgery: In order to achieve the effect of endoscopic sinus surgery, it is necessary to do some auxiliary surgery for different patients while removing the lesions, which includes removing the dissected middle turbinate, removing the polyps in the middle nasal tract, biting off the enlarged sieve bubble, correcting the high septal deviation, partial inferior turbinate removal, etc. With the widespread development of nasal endoscopic surgery and in-depth research on the physiological functions of the nasal cavity and sinuses, there is further recognition of the importance of adjunctive surgery. These procedures may seem unrelated to sinus surgery, but they can directly affect the efficacy of the surgery, and patients should have a correct understanding of this and not consider it as an additional procedure added by the surgeon.