Old yawning can be caused by physiological factors, but also by pathological factors, such as cerebral ischemia, anxiety and depression, hypoglycemia and so on. 1. Physiological factors: some patients may be due to long-term high stress or lack of sleep, resulting in increased metabolism in the brain, nerve fatigue caused by yawning, which can be relieved by timely rest and relief of mental stress. 2. Pathological factors: there are many reasons for pathological factors, such as cerebrovascular arteriosclerosis, stenosis, resulting in cerebral ischemia, hypoxia; sleep disorders caused by cerebral hypoxia; depression, anxiety, schizophrenia caused by vegetative nerve disorders; systemic diseases, such as hypoglycemia, anemia and so on. When old yawning occurs, it is recommended to go to the hospital in time to improve the auxiliary examination, clear diagnosis, and targeted treatment under the guidance of the doctor.