If it is similar to an earthworm, it should be a worm-like worm, which is called Ascaris for short. It is caused by eating water or food contaminated by fertilized eggs during ascaris infection. Adults are parasitic in human small intestine, and their burrowing habits will do harm to human body. The most common complication is biliary ascariasis. Severe cases can cause brain and lung diseases. It is rare for people like the landlord to leave the hospital naturally. You can choose to eat insecticides such as enterotoxin or albendazole to remove larvae from the body.