No, not generally. There are certainly times when correction of a posture is uncomfortable, much like working out, or performing a strenuous task of which you are unaccustomed. However, every effort is made to work within your tolerance, to make as much change as possible, in as short a time as possible, with minimal discomfort. Many times, patients have had an abnormal posture for many years. When this is the case, the muscles, ligaments, and joints are accustomed to their current position. Changing that position is important, and at times uncomfortable. However again I stress, never in such a way as to be intolerable to the patient.