Pain in the back of the head may be due to physiological factors, such as lack of rest, overwork, lack of sleep, etc. Side effects of drugs, intracranial diseases, tension headaches, neurosis, etc. can also cause pain in the back of the head. 1. Physiological factors: usually overwork, sleep deprivation, nervousness will appear in the back of the head pain, can be relieved after rest, supplemental sleep, usually without special treatment. 2. Side effects of drugs: such as morphine, pethidine and other analgesics; captopril, nitroglycerin and other drugs for the circulatory system. 3. Intracranial diseases: such as intracranial infections, intracranial space-occupying lesions, etc., which can lead to pain in the back of the head due to increased intracranial pressure. 4. Tension headache: Tension headache will have tightness and swelling in the head, which can appear in the back of the head area. 4. Neurological disorders: such as poisoning, heat stroke, neurasthenia, etc., can appear in the back of the head pain symptoms. The cause of pain in the back of the head is more complex, if the rest can not be relieved, you should go to the hospital in time to identify the cause of the disease, targeted treatment.