Whenever modern people want to talk about dumb medicine habits from the past, we use bloodletting as an example. Before the acceptance of germ theory, many doctors thought that illness was caused by an imbalance or buildup of different fluids in the body, a theory known as "heroic medicine." Cut open a vein and let out some blood, the thinking went, and you could restore a patient to balanced fluids and good health. Plus, it was metal as fuck.
Look at that shit.
But bloodletting wasn't the only treatment popular during heroic medicine's reign. It's just the one we're comfortable talking about. See, blood is gross, but at least you can bring the stuff up when you're discussing history over a beef stew dinner. This isn't the case with another, far more disgusting treatment that was also used in the time of bloodletting: laxatives. Lots and lots and lots of laxatives.