Heart’s heat stroke is the condition where you are prone to heat stroke in summertime – not physically, but psychologically, in the form of short temper and difficulty in staying calm. High-risk groups include white-collar workers under pressure and people who are poor at communicating.
“心理中暑”指的就是你在夏天容易脾氣暴躁、難以平靜的心理狀態。每天有極端工作壓力的白領和不善交流的人都是心理中暑的高發團體。

Medical research shows that people’s mood、mental state and behavior have something to do with the change of seasons. In hot summer, approximately 10% of people would appear abnormal in their mood and behavior, which is heart’s heat stroke.
醫學心理研究表明人的情緒、心境和行為與季節變化有關。在炎熱的夏季，大約有10%的人會出現情緒和行為的異常，即“心理中暑”。

Example:
He’s been irritable for several days because of working overtime. He might have a heart’s heat stroke.
他最近由于加班都暴躁好幾天了。可能是心理中暑了吧。