There are many causes of yawning, and the common causes are mainly the following: First, phytodystrophy, caused by mental stress, overwork, poor sleep quality, and frequent late nights, the body does not get a good rest as well as fatigue, yawning is good for refreshing the brain and relieving physical fatigue, so pay attention to a good routine in daily life and avoid staying up late. Second, the cerebral artery blood supply is insufficient, work and study in a closed environment can easily cause yawning, because yawning is conducive to the discharge of carbon dioxide in the body, breathing fresh air, to relieve the brain ischemia, hypoxia, is a physiological phenomenon of the body, do not need too much treatment, such as more frequent attacks, can take blood and brain particles to improve symptoms. Third, fatigue syndrome, chronic fatigue as the characteristic clinical manifestations, will also have yawning, mental lethargy and other clinical manifestations, improve the body related examination without organic lesions, through adequate rest and appropriate functional exercise, can improve the symptoms.