Sodium nitrite is harmful to the human body, which can lead to hypoxia, poisoning, carcinogenic and so on. 1. Hypoxia: after sodium nitrite enters the human body, it will oxidize the low iron hemoglobin into high iron hemoglobin in the blood, and it may make the blood lose the function of transporting oxygen, so it will lead to hypoxia of the human body, and it may cause the phenomenon of shortness of breath. 2. Poisoning: Sodium nitrite is a strong oxidizing agent, and has a certain degree of toxicity, after taking it may lead to poisoning, such as nausea and vomiting, lack of appetite, and foaming at the mouth, and so on, the serious cases may be life-threatening, and have a certain degree of bad effects on health. 3. Carcinogenic: the human body after the intake of nitrite, under certain conditions, nitrite will be converted into nitrosamines in the human digestive tract, if the intake of excessive nitrosamines, which may lead to esophageal cancer, colon cancer, stomach cancer, liver cancer, rectal cancer and other cancers. Normally, we should pay attention to the dietary habits, it is not recommended to eat food containing sodium nitrite, to avoid leading to adverse reactions in the body, affecting the health of the body.