Somatoform disorders are a group of mental disorders characterized by physical symptoms that cannot be fully explained by a general medical condition. Key features include physical complaints with no adequate medical explanation that cause significant distress or impairment. Somatization disorder involves multiple somatic complaints over several years, while conversion disorder involves neurological symptoms that are psychologically caused. Hypochondriasis involves excessive worry about having a serious illness despite medical reassurance. Treatment focuses on psychotherapy and treating any underlying mental health conditions.