Patients suffering from sinusitis, especially those suffering from acute sinusitis, have more significant headache symptoms. The main causes of headache are due to: (1) inflammatory stimulation of the nasal turbinates, nasal passages, sinus openings and sinus mucosa, swollen mucosa compressing nerve endings; (2) sinus secretion retention and accumulation compressing nerve endings; (3) sinus passages and sinus openings due to congestion and edema, occlusion of retained secretions, absorption of gas in the sinus, resulting in low pressure or vacuum in the sinus; (4) toxin production by bacteria stimulating nerve endings. These causes can not only cause facial pain, but also can often be reflected to the head to cause headache. Most of the patients with acute sinusitis have headache symptoms, and the headache is more significant. (1) Acute maxillary sinusitis is often painful in the lower part of the affected orbit, and may also have pain in the ipsilateral upper molar, and the pain radiates to the ipsilateral frontal and temporal areas, mostly persistent, sometimes episodic. The headache is mostly dull in nature. Occasionally, stimulation of the trigeminal nerve may cause pain in the second branch of the trigeminal nerve, or even reflexes to the distribution of the first branch. The headache is aggravated in the afternoon or when standing upright for a long time, and is relieved in the morning or when resting flat. (2) Acute frontal sinusitis is often painful in the affected supraorbital and frontal areas, with a more obvious time pattern, the headache is felt in the morning, gradually aggravated, alleviated in the afternoon, and the pain disappears completely until the evening. If the inflammation is not eliminated, the same attack can occur again the next day. When the headache is severe, there may be lacrimation, fear of light, combined with membrane congestion, etc. (3) Acute septal sinusitis: generally the headache is lighter, and the pain of the former group of septal sinusitis is located in the forehead, between the eyebrows or between the eyes. And the pain of posterior group septal sinusitis is mostly located in the temporal or occipital area. In contrast, the pain of acute pterygoid sinusitis is deep in the skull or can radiate to the top of the head, behind the ear. The nature of the pain is mostly dull, and sometimes there can be pain behind the eye and a feeling of pressure on the eye, especially when the eye is turned, but unlike the pain caused by the disease of the eye itself, the pain does not increase when the eye is pressed. Patients with chronic sinusitis do not necessarily have headache, but due to the long-term existence and stimulation of the lesion, in some cases they often complain of headache, but the headache is not as severe as acute sinusitis, and the nature of the pain is usually dull, inconspicuous pain, distension, or a feeling of heaviness in the head such as head swelling, dizziness, etc. The headache often has the following characteristics: (1) headache is often accompanied by nasal symptoms such as nasal congestion, runny nose and loss of smell; (2) headache also has a temporal or fixed site, such as heavy during the day and light at night, and is mostly unilateral, if the two sides must also have a heavier side, the headache site is relatively fixed according to the affected sinuses; (3) headache can be reduced after rest, nasal drops, nasal ventilation, coughing, force, and low head bending In addition, the headache can be aggravated by smoking, drinking alcohol and emotional excitement.