Remember taking ipecac syrup when you were sick because it would make you throw up and get the bad out? That’s kind of the basis for purging in the old days. They believed that there was an imbalance in the body when people had mental issues that could be resolved by things like purging and bleeding.
The items in this photo show some of the tools used in bleeding, then later in cupping. All used similarly to purging to help get the bad out so that mental acuity can be balanced. They may have also used leaches for this treatment.
In the past, people really didn’t understand illnesses like schizophrenia, mood disorders and extreme stress, so they treated them in sometimes strange and shocking ways. One of those ways was through exorcism.