This book offers a diagnostic tool for physicians and psychologists who want to systematically document pain within a multimodal structure. MACPainP (multiaxial classification of pain-psychosocial dimension) is a systematic, comprehensive and clinically oriented diagnostic instrument for evaluating pain-related disorders, and includes differentiated descriptions to enable syndromes to be systematized and diagnoses compared. MACPainP can be used as a professional add-on for the International Classification of Diseases ICD-10 as well as the upcoming pain classification ICD-11, released by WHO.  This clearly structured book provides an easy introduction to the biopsychological aspects of pain disorders, to allow a nuanced approach to the psychological diagnosis of pain patients. It discusses possible comorbidities (e.g. depressive disorders, anxiety disorders) as well as concrete behavior-related steps for pain-related psychological and medical treatments.