It's very hot, and I feel stuffy in my chest. What happened?

This is a kind of functional chest tightness (that is, chest tightness without organic lesions): if you stay in a room with hot weather, closed doors and windows and no ventilation for a long time, or encounter some unpleasant things, even quarrel with people, or in a low-pressure climate, you will often feel chest tightness and fatigue. After a short rest, open the window for ventilation or breathe fresh air outdoors, relax and adjust your mood, and you will soon return to normal. Chest tightness like this can be said to be functional chest tightness, which does not require tension or treatment.