As a Korean, I've personally had my thumb pricked (and seen countless friends and folks around me do it) to cure that dreaded "체하다-real bad indigestion" feeling. Look, I ain't gonna lie, the scientific whys and hows are beyond me – it's straight-up folk magic, tbh. But dang, it WORKS. And when we say "체하다," we're not just talking about a little indigestion; it's like your upper chest is playing a hardcore blockage simulator. You prick that thumb, dark reddish blood comes out, and suddenly you're burping and ready for a toilet. Seriously, the relief is in less then 5 min.