Placebo effect can be as high as 60%. Different conditions have different placebo responses. Researchers need to normalize their studies for placebo effect. With concussions, anxiety can be a big cause of worsening symptoms. Placebo can resolve anxiety thus reducing the symptoms made worse by anxiety. Some therapies are preceded by videos that show testimonials of success stories. Other pre-therapy explanations of what kind of results to expect can impact the placebo effect.

Paying a bunch of money can contribute to placebo effect.