Flatworms and tapeworms are parasitic worms that can infect the human digestive system, most commonly through the consumption of undercooked or contaminated meat. Tapeworms belong to the class Cestoda and can grow several metres long inside the intestines. Once inside the host, they attach to the intestinal wall and absorb nutrients, often causing symptoms such as digestive problems, weight loss, or fatigue. In many cases, however, the infection can be asymptomatic and remain undetected for long periods. Diagnosis typically involves stool sample analysis to detect eggs or worm segments.