Ear pain caused by sinusitis may be caused by affecting the Eustachian tube, or it may be caused by the complication of otitis media. Sinusitis is generally caused by bacterial, fungal or viral infections, and patients mainly manifest symptoms such as nasal congestion, thick snot and headache. If sinusitis is not treated in time, a large amount of nasal mucus produced in the nasal cavity to block the nasal cavity, affecting the ventilation of the Eustachian tube, and the Eustachian tube is connected to the middle ear, long-term ventilation is easy to cause negative pressure in the middle ear, accompanied by pain. In addition, sinusitis may also cause various complications, when the infection spreads, it may be complicated by secretory otitis media or suppurative otitis media. Secretory otitis media is mainly caused by obstruction of Eustachian tube, infection, immune response and so on. Suppurative otitis media is mainly caused by pathogenic bacteria that attack the middle ear and cause infection. Both types of otitis media can cause symptoms of ear pain in patients. Therefore, patients with sinusitis must be treated promptly to relieve symptoms and control the inflammatory response to avoid further aggravation.