There are many causes of right-sided headache, and the common ones are as follows: 1. Migraine, more common in young female patients, may appear as symptoms of temporal or bilateral temporal pain, often accompanied by nausea, vomiting, blurred vision, etc. Acute attacks of migraine can be triggered by excessive mental tension, overexertion, emotional instability, etc. 2. The symptoms of headache can be relieved after taking medication, but it is easy to recur.2. Intracranial tumors, which often cause headache on one side, it is better to check cranial MRI to exclude intracranial occupying lesions.3. Cerebrovascular diseases, including cerebral infarction and cerebral hemorrhage, are mostly seen in middle-aged and elderly people, and can be accompanied by dizziness, numbness of limbs and other symptoms. Early treatment of cerebrovascular diseases is better, and it is best to check cranial MRI and other tests to confirm early treatment. 4. Acute upper respiratory tract infection and poor sleep quality can also cause headache symptoms.