Respecting leech this thing, basically nobody can have good opinion to this kind of biology, soft soft bend over bend over, still make a living in order to suck blood, calculated the body to break still also can live, can say be a model " evil " biology.
But be in a country, leech is a kind of very common animal however, when having kind of paddy, very big may be bitten by leech adsorption, when drinking water occasionally even, still can drink leech into abdomen.
According to the village for a few people, leech takes gut in, can suck blood to grow all the time, but this kind of view is incorrect. Actually although leech is drunk to take gut in, but be opposite for the person, cause very hard however " mortality " harm.
Because although leech makes a living in order to suck blood, but not be parasitism biology however, cannot rely on parasitism to live so come down, if enter,arrive inside the person's body, because,the largest possibility is met namely anoxic strangle, perhaps be corroded by gastric juice, digestive juice, basically cause very big loss very hard to the body so.
But though won't have too big menace, but still have certain harm. Leech is entered possible meeting causes a stomach to bilge inside abdomen wait for symptom of intestines and stomach, and possible still meeting causes definite cut, cause haemorrhage symptom, if discover when to he drinks water, be drunk,entered leech so, still had better go to a hospital be being checked.
But as a whole, leech won't cause too great harm to people, also won't survive inside abdomen, calculate so leech also need not worry into abdomen.
