I used to have pinworms when I was 12. Lol. They are harmless. The just eat the food that u eat. whatever slides down they eat part of it. I just went 2 wal-mart with my mom and got some non-prescription meds. Within 3 days they were gone. p.s. the meds were a drinkable kind. The worms live throughout ur digestive track and the medicine kills them. Dont worry.