‘发烧’ literally combines ‘发’ (fā), meaning ‘to emit’ or ‘to develop’, and ‘烧’ (shāo), meaning ‘heat’ or ‘burning’. Together, they describe the physiological condition of having an abnormally elevated body temperature—commonly known as a fever. It is not a disease itself but a symptom, often signaling infection, inflammation, or other immune responses.

This verb is used almost exclusively in health-related contexts—especially when describing human physical conditions. It’s commonly paired with verbs like ‘有’ (yǒu, ‘to have’), ‘会’ (huì, ‘will’), or ‘要’ (yào, ‘is about to’) and frequently appears in medical conversations, parental concerns, or self-reporting of illness. Unlike some compound words, ‘发烧’ is inseparable: you cannot omit or reorder either character without losing meaning.