Eating salted fish can cause cancer, so far no exact cause has been identified, may be related to the production process of salted fish to produce nitrite, adding a large amount of salt, as well as the occurrence of mold and so on. In the salted fish curing process, a substance called nitrite will be produced, and the protein decomposition in the fish will produce amines, and when the two meet, nitrosamines will be formed. Nitrosamines are highly carcinogenic, and long-term consumption can induce cancer, such as esophageal cancer and liver cancer. Salted fish production, will also add a lot of salt, long-term excessive consumption of salt, will also increase the incidence of gastrointestinal diseases. Salted fish is also susceptible to mold. Bacteria can easily enter the fish and cause it to deteriorate and become moldy. Moldy food contains a large amount of aflatoxin, which is also highly carcinogenic.