Tapeworms are parasites that can live in people's intestines (bowel). They belong to a class of worms called cestoda, so are known medically as cestodes.
Tapeworms tend to be flat, segmented and ribbon-like. Humans can catch them by:
- touching contaminated faeces (stools) and placing their hands near their mouth
- swallowing food or water containing traces of contaminated faeces
- eating raw contaminated pork, beef or fish
See Tapeworm infections - causes for more information.
Getting help
If a tapeworm grows in your intestine, you will need treatment to get rid of it. Some adult worms grow to 4.5-9m (15-30 feet) in length.
You may not know that you have a tapeworm infection as it does not always cause symptoms, or the symptoms may be mistaken for another illness. A tapeworm infection typically causes stomach pain and sometimes vomiting and diarrhoea (see Tapeworm infections - symptoms for more information).
How common are they?
Tapeworm infections are most commonly seen in developing countries. In the UK, tapeworm infections in people are rare, although some types are found more often than others.
Outlook
The beef tapeworm lives only in your intestines and infection with it is easily treated with tablets.
However, infection with other tapeworms or tapeworm larvae can lead to serious complications (see Tapeworm infections - complications page). Larvae infections are more difficult to treat because the larvae will have settled in other parts of your body outside your intestines.