Sinusitis is an inflammation of the mucous membrane of the sinuses, which can be categorized into acute sinusitis and chronic sinusitis. Their characteristics are as follows: 1. Acute sinusitis: refers to an acute purulent infection of the sinus mucosa. It is often secondary to acute rhinitis. There may be nasal congestion, runny nose, olfactory impairment, rhinorrhea, local pain or headache. (1) Acute maxillary sinusitis: the general pattern of headache and localized pain is: no pain in the morning, light pain in the morning, heavy pain in the afternoon; aggravated by standing or sitting for a long time, and relieved by lying on the affected side. (2) Acute sieve sinusitis: the headache is generally mild, and its pain is generally heavier in the morning and lighter in the afternoon. (3) Acute frontal sinusitis: Early onset of headache is regular, i.e., the pain in the frontal area of the affected side often starts soon after waking up in the morning, and gradually aggravates, and is most intense at noon, until it gradually decreases in the afternoon or dusk, and then completely dissipates in the night. (4) Acute sinusitis: the general pattern of headache is light in the morning and heavy in the afternoon. 2. Chronic sinusitis: the symptoms are similar to acute sinusitis. It can be divided into chronic sinusitis without nasal polyps and chronic sinusitis with nasal polyps. It can be identified by physical examination, sinus CT and other auxiliary examinations. When the above symptoms or other discomforts occur, you should consult a doctor in time, do not judge blindly and delay the time of treatment.