Pinworms are small, white parasitic worms that commonly infect the intestines, particularly in children. They are about the size of a staple and are known scientifically as Enterobius vermicularis. The most noticeable symptom of a pinworm infection is itching around the anus, especially at night when the female worms lay their eggs. Transmission occurs through the ingestion of pinworm eggs, which can be found on contaminated surfaces, clothing, or hands. Good hygiene practices, such as regular handwashing and keeping fingernails short, can help prevent infections. Treatment typically involves over-the-counter medications that kill the worms and their eggs.