The headache caused by sinusitis has two characteristics: first, the location is fixed, either in the forehead, around the eyes or in the occipital area. Second, the timing is regular, such as gradually worsening in the morning, gradually decreasing in the afternoon, and basically relieving at night. It is mainly due to the vacuum headache caused by the high amount of pus in the sinuses, which can release endotoxin and cause neurological headache, as well as the negative pressure in the sinuses caused by the process of pus outflow. If the headache is caused by sinusitis, it is also usually accompanied by a large amount of yellow nasal discharge, nasal congestion and other nasal symptoms. The most direct and effective way to diagnose whether a headache is caused by sinusitis is through nasal endoscopy as well as sinus CT. If it is an acute infection, you can choose medication. For chronic sinusitis that is poorly treated with medication, surgery is the best option, and you must have regular follow-ups and nasal medication after surgery to effectively prevent recurrence.