Pinworm Infection Causes. You get pinworms by accidentally swallowing or breathing in their eggs. You could eat or drink something that's contaminated with them and not know it.

Pinworms are the cause of a highly contagious intestinal infection in humans. Learn about its symptoms, the tape test, and effective methods of treatment.

A pinworm or threadworm infection happens when eggs transfer from the anus or contaminated surfaces to the mouth and intestine. It causes itching. Treatment is available.

Pinworm Infection Causes. You get pinworms by accidentally swallowing or breathing in their eggs. You could eat or drink something that's contaminated with them and not know it.