The headache is especially painful, but once lying down, it will be fine. Consider overwork, insufficient cerebral blood supply and low cranial pressure headache, etc. It is recommended to go to the hospital for further examination to clarify the cause of the headache. 1. Clinically, there are many causes of headache, the most common ones are due to excessive fatigue, smoking, drinking, emotional changes and other causes of vascular spasms, resulting in head swelling and pain, but lying down and resting will ease. 2. Due to low blood pressure, anemia, long-term head down cervical compression of blood vessels, etc. may lead to insufficient blood supply to the head, causing drowsiness and pain in the head when standing upright. Lying flat and resting will help to relieve it. 3. In addition, if the recent lumbar puncture or trauma caused by cerebrospinal fluid leakage, etc. may cause low cranial pressure headache, manifested as sitting or standing headache obvious, may be accompanied by nausea, vomiting, lying down the position of the symptoms can be quickly relieved. It is recommended to consult a doctor in time for the symptoms of headache, and to clarify the cause and reasonable treatment under the guidance of the doctor.