The following links are in English Pinworms - Group Health Cooperative Pinworms are tiny organisms that can live in the lower digestive tract of human beings. They are harmless, but produce severe rectal itching, the only symptom.
Pinworms are extremely common, affecting all ages and people on all social and economic levels.
An estimated 10 percent of the general population will experience pinworm infection at some time. The female worms lay their eggs around the anus at night. Symptoms include anal itching, sleeplessness, irritability, and anal irritation due to scratching. Pinworms may also be present without symptoms. Pinworms are common in school-aged children.