劳神 literally combines 劳 (láo, 'to toil' or 'to strain') and 神 (shén, 'spirit' or 'mind'), meaning 'to strain one's mind' or 'to rack one's brain.' It emphasizes mental exhaustion from overthinking, excessive worry, or prolonged concentration — not physical labor. The word carries a slightly negative or cautionary tone, often implying that the mental effort is unnecessary, unproductive, or harmful to one’s well-being.

This term is commonly used in advice-giving contexts ('Don’t劳神over small things'), health discussions about stress management, or self-reflection ('I’ve been劳神too much lately'). It frequently appears with negation (别劳神, 不必劳神) or as part of set phrases like 劳神费心 (láo shén fèi xīn, 'to trouble oneself unnecessarily'). Unlike generic verbs for 'think' (e.g., 想), 劳神 specifically conveys mental fatigue and emotional cost.