Functional Disorders (FD) are conditions where patients complain of multiple medically unexplained physical symptoms. FD defy the clinical picture of any conventionally defined disease and cannot adequately be supported by clinical or para-clinical findings. The disorders are common in all medical settings, both in primary and secondary care. The conditions range from mild to severe and disabling, they are costly for society due to the patients' high health care use, and the patients' social and functional level is reduced. There is no well-established, effective pharmacological, or psychotherapeutical treatment offer today.