Brain has a tremendous affect on pain. Most “pain clinics” just prolong or medicate physical pain in the body brought on by inaccurate knowledge given to your brain that activates pain to protect you. Drugs or exercise don’t fix it. Anxiety, fear, unexpressed anger causes pain. Dr John Sarno wrote the book describing this common phenomenon he called TMS. Tension Myositis Syndrome. This is where most pain comes from along with other chronic conditions that bother some but not others. I have stopped several pain issues—back, foot, knee, hip by employing his and other peoples practices to deal with what our subconscious minds sees as danger. It’s a fascinating field.