You can get a tapeworm by drinking water contaminated with tapeworm eggs or larvae. Raw or undercooked meat is another way these flatworms can find their way into people.
Tapeworms embed their heads into the intestinal wall and remain there. From there, certain types of tapeworms can produce eggs that migrate to other parts of the body.
A tapeworm looks like a long, white ribbon. They can grow up to 50 feet long and live in a human for up to 30 years.