In general, betel nut is okay to eat twice in a while, but chewing betel nut for a long period of time may cause cancer, so it is not recommended to chew and consume it. Betel nut is not only a kind of medicine, but also a kind of food. In some areas of China, betel nut is used as a chewing hobby, due to the hardness of betel nut, long-term chewing of the oral cavity caused by mechanical damage and the formation of nitroso compounds after chewing will increase the risk of oral cancer, the International Cancer Center in 2004 will be listed as a class I carcinogen, so it is not recommended to chew and eat often. In addition, betel nut alkali in betel nut will not only stimulate the gastric mucosa may lead to indigestion, bloating and other symptoms. Consumption of betel nut should be in moderation, try not to consume, to avoid adverse consequences.