What causes the pain in the back of the head?

Headaches can be caused by stimulation of pain-sensitive structures in the brain. The most common are primary headaches, including migraine and tension headaches. The second is brain tissue contusion or cerebral hemorrhage. The third is headaches caused by non-vascular intracranial diseases, such as high intracranial pressure, low intracranial pressure, and brain tumors. The fourth is excessive use of substances or withdrawal from substances, such as drugs and alcohol, which can also cause headaches. Another type is intracranial infection, such as meningitis, encephalitis, etc. There is glaucoma, can also cause headaches, to be checked one by one.