What is the cause of headache?

The causes of headache are as follows: first, lack of sleep is also a common cause of headache, such as staying up late or insomnia on the first night, and getting up the next day will cause a splitting headache. I believe many people have had this phenomenon. Second, external stimuli, if the body and mind are adversely stimulated by the outside world, it will produce negative emotions such as depression and anxiety, which will lead to the onset of headaches. 3. Physical compression refers to headache symptoms caused by inflammation, injury or tumor compression of pain-causing tissues inside and outside the skull, which are manifested as meningeal stimulation, vasodilation, traction, displacement and muscle contraction.