Snuff is sinusitis. Inflammation of sinus mucosa. Among all kinds of sinusitis, maxillary sinusitis is the most common, followed by ethmoid sinus, frontal sinus and sphenoid sinusitis. Sinusitis can be single or multiple. The most common cause is suppurative inflammation of sinuses after nasal infection. In addition, allergic reaction, mechanical obstruction, air pressure change, etc. are all easy to induce sinusitis, and tooth infection can cause odontogenic maxillary sinusitis. Acute sinusitis often has symptoms such as nasal congestion, increased purulent nose, decreased sense of smell and headache after catching a cold. Inflammation and headache of the anterior sinus (maxillary sinus, frontal sinus and anterior ethmoid sinus) are located in the forehead; Inflammation of the posterior sinus (posterior ethmoid sinus and sphenoid sinus) is a headache in the top of the head or occipital region. Different sinusitis has different headache symptoms. For example, people with frontal sinusitis often have headaches on their foreheads shortly after getting up in the morning, which gradually get worse and will be relieved in the afternoon. Patients with acute sinusitis may be accompanied by fever and general malaise. The nasal mucosa is congested and swollen, there is purulent secretion in the middle nasal passage or olfactory cleft, and there is tenderness in the corresponding sinus area. X-ray film of sinus is helpful for diagnosis. Antibiotics and sulfonamides can be used all over the body, and vasoconstrictor nasal drops, physiotherapy and traditional Chinese medicine have certain effects. Patients with maxillary sinus empyema can puncture the maxillary sinus to discharge pus and inject anti-inflammatory drugs.