Pinworms are tiny, white worms that live in the large intestine. They look like pieces of white thread. Pinworms are not a disease but they can make a child uncomfortable.
Pinworms come out of the anus (bum) at night and lay their eggs on nearby skin. The worms may be seen with a flashlight, as crawling threads around the bum after the child has been asleep for about an hour.
Pinworms are common among preschool and school-age children. Usually children with pinworms have no symptoms but may be very itchy around the bum and vagina.
Pinworms can be treated with medicine.
A child can get pinworms again by coming into contact with pinworm eggs. To stop the spread of pinworms, all caregivers and children may need to be treated.