Many people seem to associate ancient medicine with some kind of lost wisdom, but the fact is that many people in the past were just as prone to faulty thinking as we are today.
The funny thing is that some medieval medicine just doesn't seem to capture the public's imagination the same way every time. I don't hear many people wanting to bleed patients out just to fix their colds and arthritis. It is really interesting that some people today actually claim to have undergone self-trepanation and have benefited from it! I think that says a lot about the power of positive thinking.
According to rock legend, John Lennon was very interested in trepanation and wanted himself and the three other Beatles to go through with it to benefit from the increased state of consciousness it was supposed to give them. I guess the allure of New Age medicine knows no bounds for some people.