Rhinogenic headache refers to headache caused by nasal and sinus lesions. Acute inflammation of the sinuses is the most common, accounting for about 5% of all headaches. Other conditions such as acute and chronic rhinitis, chronic sinusitis, atrophic rhinitis, and deviated nasal septum can also cause headaches. How to diagnose rhinogenic headache? 1.Signs: anterior rhinoscopy or nasal endoscopy can reveal lesions of nasal mucosa, turbinates, nasal tract or nasal septum, such as dark redness of nasal mucosa, congestion and edema of turbinates, purulent discharge from nasal tract, nasal lychee meatus-like neoplasm, deviation of nasal septum, and even nasal tumor. 2, nasal examination: anterior rhinoscopy, may see chronic congestion of the nasal mucosa, swelling or hypertrophy, middle turbinate hypertrophy or polyp-like changes, narrowing of the middle nasal tract, mucosal edema or polyps, etc. In anterior group sinusitis, there is pus in the middle nasal tract; pus in maxillary sinusitis is usually in the lower posterior part of the middle nasal tract and can flow down the inferior turbinate, accumulating in the bottom of the nasal cavity and the inferior nasal tract. In frontal sinusitis, pus mostly flows down from the anterior segment of the middle nasal tract. In the anterior group of septal sinusitis, mucous pus is seen in the middle nasal tract. In posterior sinusitis, pus flows down from the olfactory fissure and is retained in the posterior part of the nasal cavity or flows into the nasopharynx. Posterior rhinoscopy should be performed if necessary and can help to observe whether there is pus in the upper nasal tract. If septic sinusitis is suspected and no pus is seen in the nasal tract, 1% ephedrine can be used to shrink the nasal mucosa and then make a postural drainage method to help diagnose. The use of fiberoptic nasopharyngoscopy or nasal-sinus endoscopy auxiliary examination, observation of the mucosal changes in the walls of the nasal cavity and the opening of the sinuses, as well as the secretions of the sinus mouth, is more helpful in the diagnosis. 3. Oral and pharyngeal examination: In case of odontogenic maxillary sinusitis, lesions may be detected in the ipsilateral maxillary 2nd bicuspid or 1st and 2nd molars. Posterior group sinusitis is sometimes seen with purulent secretions or dry crusts on the posterior pharyngeal wall. 4.CT scan: When examining sinusitis, it is possible to clearly observe whether the sinus wall is damaged and the extent of mucosal lesions in the sinus cavity.