Helminthology is the study of parasitic worms, including roundworms (nematodes), flatworms (trematodes), and tapeworms (cestodes). These parasites can infect humans and animals, often living in the intestines, blood, or tissues. Helminth infections are common in tropical and subtropical regions with poor sanitation. They can cause diseases such as schistosomiasis, ascariasis, and echinococcosis. Diagnosis typically involves stool examination, blood tests, or imaging techniques. Helminths can affect growth, nutrition, and immune function, especially in children. Treatment usually includes anthelmintic medications like albendazole or praziquantel. Helminthology is vital for understanding parasitic diseases and improving public health.