In our nature, the toxins of venomous snakes are often divided into three kinds, the first is neurotoxic, the second is blood poison, and the third is mixed poison. The symptoms after being bitten by a venomous snake are related to different snake toxins, as follows: 1. Neurotoxicity: mainly seen in silver-ringed snakes and cobras, patients bitten by venomous snakes often show weakness in opening the eyes, dilated pupils, difficulty swallowing, drooling, weakness of the limbs, and in severe cases, there may be breathing difficulties and laryngeal edema; 2. Blood toxicity: mainly seen in five-step snakes, pit vipers, branded iron heads and bamboo leaf green, often causing wound The wound is often painful, often manifesting as a burning sensation, with gradual swelling, bruising and even blistering around the wound, often causing skin ulceration and necrosis, and often causing impaired coagulation, such as a drop in platelets, resulting in intracranial and visceral bleeding and life-threatening; 3. weakness in eye opening and weakness in limbs.