Areca catechu, as one of the four southern medicines in China, has 225 kinds of Chinese herbal medicines. "The Origin of Miscellaneous Diseases and Rhinoceros Candles" written by Ao in Qing Dynasty explains: "Stomach pain is also a disease. If the stomach qi stagnates, the stomach qi will be unhealthy, and the gas of food intake will come from the inside, making it impossible to communicate. Often there will be more upward gas, and the upward gas will be slower, but it will also go down, because the downward gas has recovered. " The so-called lower qi refers to gastrointestinal diseases, that is to say, betel nut not only detoxifies, but also has the functions of digestion, diuresis and qi regulation.