Pretty much all my answers here are from what I have learned through reading John Barnes' books and attending his seminars. When A person is being treated using JFB-MFR, the fascia will soften and lengthen, allowing muscles, osseous structures, nerves, vessels, and organs to return to proper positioning and function. This in itself is going to cause some soreness. That is part of the healing crisis. Also, there are toxins from medications, anesthesia, and other toxins in our food and environment that are locked in our fascial tissue that get released for elimination during treatment. This may often cause soreness, achiness, headaches, even nausea in some cases. It can make you very tired, cranky, or lethargic. In addition, body memories can be released regarding old injury, accident, and/or trauma both physical and emotional that the patient will need to revisit. How these memories need to be dealt with is very individual, not only to the person involved, but also to the particular situation.