From the perspective of traditional Chinese medicine, often staying up late, poor sleep quality, and long-term mental stress may lead to insufficient gastric yin in the human body. From the perspective of the Five Elements theory, the stomach belongs to "dry soil" and "likes moistening and hates dryness". It is like dry land and hopes to be moistened by water. ? "Deep sleep is a way to nourish yin" is a famous saying in traditional Chinese medicine. Therefore, if a person's sleep quality is not high and he often stays up late, he will easily "secretly consume Yin fluid". In addition, human body sweat also belongs to "yin fluid". The reason why many people can't eat well and sweat a lot in hot summer is also related to the damage of yin fluid. In addition, the relationship between the liver and the stomach is also very close. The transportation and transformation functions of the spleen and stomach depend on the release of liver qi. Emotions such as tension, anxiety, depression, and anger can easily damage the liver and cause a series of digestive tract symptoms, such as loss of appetite, Stomach bloating, stomach pain, vomiting, belching, etc.