Sinusitis is an infection of the sinuses caused by viruses, bacteria, and fungi. The typical symptoms of sinusitis are nasal congestion, runny nose, headache, and some patients may experience ear pain, usually due to negative pressure in the middle ear or concurrent otitis media. When suffering from sinusitis, the nasal cavity tends to produce a large amount of yellow pus nasal discharge, which can lead to nasal congestion, poor nasal drainage, swelling of the nasal mucosa and enlargement of the inferior turbinate, thus affecting the ventilation of the eustachian tube. The eustachian tube is the tube that connects the middle ear to the outside world. When the ventilation becomes poor, it can lead to the formation of negative pressure in the middle ear and the phenomenon of ear congestion and tinnitus. If this condition is not relieved, it can cause a stuffy feeling in the ear in severe cases. In addition, if the patient is seriously ill, sinusitis infection can travel retrograde from the eustachian tube to the middle ear, causing acute otitis media, which in turn can cause ear pain. In the treatment of sinusitis, patients can actively use antibiotics under the guidance of a doctor to reduce inflammation, and also apply decongestants to accelerate the decongestion of the nasal mucosa and promote nasal drainage. The nasal cavity can also be fully flushed with saline and treated with nasal drops containing hormones. If the pain in the ear is unbearable, pain relieving drugs can be applied appropriately.