Headache is a common clinical symptom, usually confined to the upper part of the head, including the eyebrow arch, the upper edge of the auricle and the pain above the line of the external occipital protuberance. There are many causes of headache, including neuralgia, intracranial infection, intracranial space-occupying lesions, cerebrovascular diseases, extracranial head and facial diseases, and systemic diseases such as acute infection and poisoning. The age of onset is common in youth, middle age and old age.
Headache causes many causes, can be roughly divided into primary and secondary two categories. The former can not be attributed to a specific cause, also known as idiopathic headache, such as migraine, tension headache; The causes of the latter may involve various intracranial lesions such as cerebrovascular diseases, intracranial infection, craniocerebral trauma, systemic diseases such as fever, internal environment disorders and abuse of psychoactive drugs.
But about 5% of the world’s population has never experienced a headache.