expression
have a pain in one's chest; feel tightness in the chest
Describes physical chest discomfort, pressure, or pain. Can also be used figuratively for emotional distress, but the physical sense is the focus here.
最近、階段を上ると胸が苦しくなる。
Lately, my chest feels tight when I climb stairs.
胸が苦しくて、病院に行った。
I had chest pain and went to the hospital.