gastroenteritis
Medical term for inflammation of the stomach and intestines, commonly referred to as stomach flu.
I went to the hospital because of gastroenteritis.
Gastroenteritis tends to spread in winter.
腹痛 is a general stomachache, whereas 胃腸炎 specifically refers to the medical condition of gastroenteritis.
Compound of 胃 (stomach), 腸 (intestines), and 炎 (inflammation).