4. Bloodletting
Bloodletting was one of the most enduring and popular medical practices in history, originated by the Greeks and used up until the 19th century for, well, basically everything. If you were feeling under the weather back in the day there's a good chance it was because you just had too much damn blood.
Now, a person having too much blood may sound about as absurd as a person breathing too much air or you coming home to find too many naked supermodels in your bed. But, that's just because you don't know about the four humours. Don't worry, we won't hold your ignorance against you. Basically the theory was that the body was filled with four fluids (blood, phlegm, yellow bile and black bile) called humours and that any imbalance in the four was the root of all illness. Apparently blood can be a bit of a space hog and thus often some had to be bled out to make room for more fun stuff like phlegm and black bile (a.k.a. diarrhea), or so the theory went.
If you're wondering whether or not it works, the next time you're on your death bed with the flu, drag yourself out of bed and go downtown and give anywhere up to 4 quarts of blood; that's bloodletting for you, except you usually didn't get orange juice and a cookie after. Now, there is a chance you'll feel a bit better as you take a delirious blood loss inspired trip through the clouds on a golden unicorn, but we can assure you your flu probably won't be cured.
3. Hard Core Diet Remedies
While fuller figures have been popular for most of history, during the 20th century thin was in for women (which explains why it's known today as the "no fat chicks" century. Well, at least by us). This need to be slim led to the creation of countless "diet pills" that promised to help you melt away those pounds and inches.
While a lot of the pills actually did help with weight loss, they also often caused fevers, heart troubles, blindness, death and birth defects. They couldn't have been all bad though, as in the 1950s and '60s women who took diet pills liked them so darn much they just couldn't seem to stop taking them. Of course, it might have had something to do with the fact that the diet pills of the '50s and '60s were in actuality bottles of pure crank. But hey, what's getting addicted to amphetamines when being ready for bathing suit season hangs in the balance?
Oh, and since we just can't resist grossing you fine readers out, there have long existed stories that in the 1920s and '30s capsules filled with dehydrated tapeworms or tapeworm eggs were sold as diet pills.
There's some debate over whether these actually existed, but it seems like it could be true as various advertisements for the wormy pills have survived. Besides, if there was a market for the nut shock belt ...
2. Trepenation
Trepanation is a fancy word for drilling holes in your head. This is actually the oldest surgical procedure known to man as humans have been intentionally knocking holes in their skulls dating back to the time of cavemen, giving hope to anyone who's had to watch the sitcom starring the Geico cavemen that all of them might die in a trepanation experiment horribly gone wrong in an upcoming episode.
Historically trepanation was most commonly used as treatment for seizures and migraines. Surprise, surprise. Having a gaping hole drilled in your skull (usually without anesthesia) did very little to help people's headaches or brain issues. Trepanation was also used as an extreme form of cosmetic/experimental body modification amongst several societies such as the Incans and Mayans. These societies also got largely wiped out, then a few hundred years later suffered the indignity of having an insulting Mel Gibson movie made about them, so it didn't really work out that well.
Oh, and yes, a few brilliant individuals still practice trepanation to this day. To give you an idea of the oh-so-solid ground today's trepanation supporters' beliefs are built on, the biggest modern proponent of trepanation is a "Doctor" Bart Hughes. We put doctor in quotations marks because he never actually finished medical school. That's right kids, you, too, can be a college dropout and yet still go onto a career convincing people around the world to do incredibly retarded things, so reach for those stars.