The causes of stomach worms in adults include not paying attention to hand hygiene, drinking or eating water or food contaminated by parasites, and close contact with parasite-infected people. 1. Don’t pay attention to hand hygiene: the soil contains eggs or larvae of some parasites, and if you don’t clean and disinfect your hands after touching the soil, you can be infected with parasites indirectly. Such as roundworm, hookworm, etc. 2. Drinking or eating water or food infected by parasites: it is a more common way of transmission. Such as amoeba, schistosomiasis and other parasites can contaminate water sources. 3. Close contact with parasite-infected people: e.g. Trichomoniasis vaginalis can be transmitted through sex, e.g. scabies mites can be transmitted through skin contact. For the causes of worms in the stomach of adults, it is recommended to consult a doctor to clarify the causes and conditions in conjunction with medical history, fecal smear and abdominal ct.