YSK That if you occasionally feel a sharp pain in the chest/heart area that quickly goes away, it is probably the non-threatening "Precordial Catch Syndrome" and you should just take a deep breath to make it stop
from /r/YouShouldKnow
YSK あなたが時々、胸や心臓のあたりに鋭い痛みを感じ、すぐに消えてしまうなら、それはおそらく脅威ではない「前胸部キャッチ症候群」であり、深呼吸をすれば止まるはずです。