This document defines and describes enteroenteric and enterocutaneous fistulas. It discusses their pathophysiology, causes, classifications, clinical presentation, investigations, management, factors preventing closure, and prognosis. Enteroenteric fistulas are abnormal connections between two epithelial surfaces that can be congenital or acquired. Enterocutaneous fistulas create an abnormal tract connecting the intestines to the skin surface. Management depends on the type and includes supportive care, defunctioning stomas, drugs, and operative repair. Prognosis depends on the patient's condition, cause, and severity of the fistula.