腿疼 (tuǐ téng) literally combines 腿 (tuǐ), meaning 'leg', and 疼 (téng), meaning 'to hurt' or 'pain'. Together, it means 'leg pain' — a common noun used to describe discomfort, soreness, or injury in one or both legs. It functions as a compound noun in Chinese and is frequently used in medical contexts, daily conversation, or when describing physical symptoms.

This term is neutral in register and appropriate for speaking with doctors, family members, or friends. Unlike English, where 'leg pain' may be modified by adjectives like 'sharp' or 'dull', Chinese often adds descriptive verbs or adjectives before the noun (e.g., 剧烈腿疼 — 'severe leg pain') or uses measure words only in specific constructions (e.g., 一阵腿疼 — 'a bout of leg pain'). It is not used attributively without modification (you wouldn’t say *腿疼医生*; instead, say 腿疼的医生 — 'a doctor who has leg pain').