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Definition
By Mayo Clinic staffPinworm infection is the most common type of roundworm infection in the United States. Roundworms are parasites that use your body as a host to stay alive and reproduce. Inside your body, the pinworm's microscopic eggs hatch and grow into adults, measuring 0.2 to 0.4 inches (5 to 10 millimeters). The worms mature in your intestine and then travel through your digestive system to lay eggs in the anal area.
Many pinworm infections cause no symptoms or cause only mild digestive problems. But if you're infected with hundreds of worms, more serious symptoms and complications can occur.
The good news is that pinworm infections can be treated effectively with medications. There are simple steps you can take to prevent infection with pinworms, mostly involving good hygiene.
