Schistosomiasis is a disease caused by parasitic worms known as schistosomes. These worms live in freshwater and can enter the human body through the skin, often during activities like swimming or bathing in contaminated water. Once inside, they can cause a range of health issues, including abdominal pain, diarrhea, and even severe organ damage if left untreated. The disease is prevalent in tropical and subtropical regions, particularly in parts of Africa, South America, and Southeast Asia. Preventive measures include improving sanitation, providing clean water, and educating communities about the risks associated with contaminated water sources.