Yawning all the time is caused by lack of oxygen in the brain, low oxygen content in the blood, hyperlipidemia, and high blood viscosity.1. For lack of oxygen in the brain, frequent yawning is a precursor symptom of posterior circulation infarction, that is, brain stem and cerebellar infarction. If you are middle-aged or elderly and have risk factors such as smoking and drinking, hypertension, hyperlipidemia, and diabetes, it is very likely that frequent yawning is a precursor to posterior circulation infarction. Although there are no problems with physical activity, speech expression, and vision, frequent yawning should be examined in a timely manner at a hospital, and a specialized examination by a neurologist to determine whether it is a precursor of an acute infarction, and if so, it needs to be treated in a timely manner. 2. Low oxygen content in the blood, such as frequent snoring at night, which is apnea syndrome, or mucosal hypertrophy of the posterior turbinate, requires a visit to an ENT Specialized consultation, sleep monitoring is needed to determine the extent of the condition of nocturnal sleep apnea. For people with hyperlipidemia and high blood viscosity, first of all, blood tests, especially lipid tests, should be performed to assess the degree of lipid level. At the same time to control the diet, to do some appropriate exercise. Fatty and greasy foods, fatty foods and nuts with high fat content such as peanuts and melon seeds need to be controlled, as they contain more lipids and can easily cause hyperlipidemia, especially elevated LDL, which can cause damage to the heart and brain.