Medically reviewed by Robert Burakoff, MD Key Takeaways Diarrhea and stomach pain can happen if you have a heavy intestinal worm infection, like tapeworm.You can check your poop for worms to see if ...

Pinworms involve infection by a parasitic worm that may live in the large intestine of a human. A child may contract the infection after unknowingly transferring the worms into their body from a ...