Salted fish is carcinogenic. Salted fish often appear on the table, belongs to the salted food, in the processing process will add a lot of salt, which produces dimethyl nitrite, in the body is more easily converted to dimethyl amine nitrite. Dimethylnitrosamine is a strong carcinogen, nasopharyngeal cancer, esophageal cancer, stomach cancer and many other cancers are related to dimethylnitrosamine. As early as 2017, the World Health Organization has classified salted fish as a class 1 carcinogen. In addition, foods such as salted eggs, salted meat and ham may also induce cancer. In the dietary process, it is recommended to reduce the intake of salted food and strictly control the intake of nitrate and nitrite to reduce the probability of inducing cancer. Meanwhile, focus on dietary matching and balanced nutrition.