After the leech drills into the human body, different treatment methods can be taken according to the different conditions of the patients as follows: 1. Because the leech is accompanied by suction cups around the mouth that will be adsorbed in the skin and mucous membrane, the patients should not blindly pull and tug by themselves, which may pull off the leech and cause the residue of the leech in the body. It is suggested that the patient should go to the hospital as soon as possible. The dehydration of the leech can be promoted by applying concentrated sodium chloride and high sugar solution externally, and once the sucker is loosened, the leech can come out by itself. The wound can be given alternate rinses of vital iodine, hydrogen peroxide and saline to disinfect thoroughly. If necessary, tetanus antitoxin can be injected to avoid causing tetanus infection; 2. If the patient eats or drinks with the leech drilling into the body, the patient will have abdominal pain and abdominal distension at this time. The leech can be pulled out of the body by taking lactulose, Benetong tea and other laxative drugs orally, so as to reduce the damage of the leech to the human body.