心跳 (xīn tiào) literally means 'heart jump' — combining 心 (xīn), meaning 'heart', and 跳 (tiào), meaning 'to jump' or 'to beat'. It refers specifically to the rhythmic contraction of the heart muscle that pumps blood through the body. In everyday Chinese, it’s used both medically and figuratively: doctors monitor a patient’s 心跳 to assess cardiovascular health, while in emotional contexts, it often describes physical reactions to excitement, fear, or attraction — for example, 心跳加快 ('heartbeat speeds up') when nervous.

This word is neutral in register and appears frequently in health education, medical reports, fitness tracking, and descriptive writing about emotions. Unlike English, where 'heartbeat' is rarely used in isolation to express emotion, Chinese speakers may say 我的心跳好快！('My heartbeat is so fast!') to convey sudden excitement or anxiety — making it more emotionally expressive than its English counterpart.