Red-necked snakes belong to the so-called non-venomous snakes, which do not have typical poisonous weapons, and they also have venom glands that are associated with poisonous snakes. Similar glands, known as Dufono's glands. And different venom glands have different toxic effects, manifested as bleeding, hemolysis, dyspnea, kidney damage and so on.

The red-necked trout snake is a kind of snake of the serpentidae family. The red-necked trough snake is a slightly poisonous snake with rear hook teeth. It is not lightly poisonous. Sensitive individuals have obvious symptoms of poisoning and require hospitalization if necessary. Clinically, it is seen that patients bitten by the red-necked trough snake have unstoppable wound bleeding and even a tendency to bleed all over the body, but the general situation is not serious, and circulatory insufficiency and MODS are rarely seen. Unless the bleeding can not be stopped, causing hemorrhagic shock, or bleeding of vital organs such as cerebral hemorrhage and death.