(1) the cause of the disease:

1, mistakenly use nitrite as salt.

2, "industrial salt" used as salt.

3. The pickled meat products with high nitrate or nitrite content, pickled vegetables and deteriorated vegetables can cause poisoning.

4, drinking water containing high levels of nitrate or nitrite bitter water, steam water, can also cause poisoning.

5, meat processing excessive use of nitrite, can cause food poisoning.

6, after cooking the vegetables in the container unclean in storage for too long, reducing bacteria under the effect of nitrate, nitrate is reduced to nitrite in vegetables.

7, in a period of time, focus on eating a large number of leafy vegetables, such as spinach, cabbage (not spoilage) and so on.

(two) pathogenesis: the principle of nitrite poisoning is its interaction with hemoglobin, so that the normal two valent iron is oxidized to ferric iron to form methemoglobin. Methemoglobin can inhibit the normal hemoglobin carrying oxygen and releasing oxygen, which makes the tissue hypoxia, especially the central nervous system hypoxia more sensitive.