Look into the death of George Washington. His doctor responded to what could have been a mild cold by taking a liter of blood 4 separate times from him. Washington very well could have recovered if he was just left alone.

Oh, and the doctor somewhat realized his mistake and tried to put some of the blood back after(!) Washington expired, with the logic that if blood loss killed him giving it back should revive him.

So yeah. Pumping blood back into a dead man. That was done on the founding president of the United States.

Unless you have excess swelling in specific parts of the body, like a cranial bleed, which does require letting out some blood to relieve pressure that can kill you. And leeches are used medically for relieving some types of swelling as well. Then there is maggots that can be used for infections to eat dead skin. All of those practices came from some specific medical treatments that did work for some specific types of injuries, although a few of them were overused for things that had nothing to do with why they existed in the first place which was counterproductive.

So while not asking for it is good advice, don't turn it down if an actual licensed medical doctor recommends them as a treatment that has been supported by evidence.

Adding to the ACKSHSCHUALLYies...

If you have hemochromatosis, and you get sick from it, you probably should be asking about bloodletting. Regular bloodletting is one of the most effective and cost-efficient treatment options available to reduce or prevent the myriad of complications caused by this health condition.