Schistosomiasis, also known as bilharzia, snail fever, and Katayama fever, is a disease caused by parasitic flat worms of the Schistosoma genus. It may infect the urinary tract or the intestines. Signs and symptoms may include abdominal pain, diarrhea, bloody stool, or blood in the urine. In those who have been infected chronically, liver damage, kidney failure, infertility, or bladder cancer may occur. In children, it may cause poor growth and learning difficulty.