Headaches, also known as headaches, result primarily from stimulation of pain-sensitive structures inside and outside the skull. Specific causes can be categorized into 3 main groups: primary headaches such as migraines; secondary headaches such as traumatic brain injury, cerebral hemorrhage, colds, etc.; and headaches caused by trigeminal neuralgia, pressure pain, and other structural lesions of the head and face. Primary headaches include: migraine, tension headache, cluster headache and so on. Called primary headache, this type of headache usually after head CT and other related examination, will not find obvious organic lesions. This type of headache has a certain relationship with genes, mental tension, stress, late night and other factors. Patients with secondary headache have clear causes of headache, such as trauma to the skull and brain, cerebral hemorrhage, subarachnoid hemorrhage, meningitis, encephalitis, brain tumors and so on. Systemic diseases such as colds, anemia, uremia, etc., sometimes lead to headaches. Lesions of the structures of the head and face also often spread to the skull and cause headaches. Examples include trigeminal neuralgia, occipital neuralgia, periodontitis, and so on. In addition, occasional headaches can be caused by physiological reasons such as late nights, exertion, work stress, and so on. Usually after sufficient rest and improvement of lifestyle, these headaches will mostly be relieved.