Worms are parasites that live inside bodies and consume what the person eats, therefore the person doesnt appear to put weight onto other parts of their body no matter what they eat
In medical terms, its a group of invertebrate animals which may infest the human intestine, ie a parasitic infection of the intestinal or urinary tract { common in egypt] the parasite enters the skin from contaminated water, and causes diarrhoea, haematuria, and anaemia,