E21: What Actually is the Placebo Effect? Part II

The placebo effect is far more powerful, and potentially more dangerous, than most people realise. Expectation can trigger real biochemical changes in the brain, ease symptoms, and even nudge dopamine release in Parkinson's disease, but it can also create side effects out of thin air and quietly distort treatment decisions. In the second part of their examination of the placebo effect, Sandy Weir and Ross Cagan dig further into the science behind placebo and nocebo, showing why "feeling better" is not the same as "being better." They use striking examples from Parkinson's, asthma, COVID vaccine trials, pain relief, and cancer care to show where placebo responses help, where they mislead, and why the line matters so much in real medicine.