The common causes of right-sided headache are as follows: First, the most common cause of right-sided headache is migraine, which is mostly found in young people or middle-aged people, and can be triggered by high mental stress, irregular rest and diet, as well as frequent eating of barbecue and drinking coffee and strong tea. Secondly, neuralgia caused by herpes zoster needs to be excluded. If herpes or small blisters appear on the right side of the head, it is likely to be neuralgia caused by herpes zoster. Third, right-sided headache may be related to high intraocular pressure, such as glaucoma or eye diseases, and requires a visit to the ophthalmology department. Fourthly, right-sided headache may also be related to sinusitis or even periodontal disease, which are relatively rare clinical causes, and these diseases will be accompanied by clinical symptoms of the nose or teeth, and can be identified.