Cháng wèi literally combines 肠 (cháng), meaning 'intestine', and 胃 (wèi), meaning 'stomach'. Together, they refer to the digestive tract as a functional unit — not just the physical organs, but the entire system responsible for digestion and absorption. In everyday Chinese, this term is commonly used in health-related contexts to talk about digestion, discomfort, or overall gut health.

Unlike more clinical terms like 消化系统 (xiāo huà xì tǒng, 'digestive system'), 肠胃 carries a colloquial, holistic connotation — often implying sensitivity, balance, or wellness. You’ll hear it in phrases about diet ('protect your cháng wèi'), illness ('my cháng wèi feels off'), or traditional medicine concepts like 'cold cháng wèi' (肠胃寒) indicating digestive weakness. It’s rarely used in isolation; instead, it appears in compounds like 肠胃炎 (cháng wèi yán, 'gastroenteritis') or 肠胃不适 (cháng wèi bù shì, 'digestive discomfort').