Allergic sinusitis is a type of sinusitis that is caused by a series of allergic reactions in the sinus mucosa due to external allergen stimulation, resulting in edema and increased secretions in the sinus mucosa, and in severe cases, allergic sinusitis can be combined with bacterial infection, resulting in purulent sinusitis. Allergic sinusitis is often combined with allergic rhinitis, and in addition to the usual symptoms of sinusitis, such as headache, blocked nose, thick runny nose, and decreased sense of smell, there may be a combination of itchy nose and sneezing. The diagnosis of allergic sinusitis may be made mainly by CT examination, which will show diffuse edema and hypertrophy of the mucous membrane of multiple sinuses, especially with the septal sinus as the center, and there is a certain difference from ordinary purulent sinusitis, which, in addition to mucous membrane edema, will reveal the accumulation of purulent secretions in the sinuses, unlike allergic sinusitis, which is widespread. Allergic sinusitis treatment, in addition to the general treatment for sinusitis, may need to add anti-allergy drugs, especially anti-histamine drugs, such as loratadine oral, nasal spray hormone nasal spray can effectively control allergies, reduce allergic sinusitis caused by a series of clinical symptoms.