Type D personality is prevalent in approximately one third of individuals with chronic pain and cardiovascular conditions. Type D personality has been associated with several psychological problems including eveningness, mood disorders, eating disorders, addiction, ageism, and suicidal ideation. Eveningness has been the diurnal preference of those with a Type D personality. At least one mood disorder was noted in 70% of Type D samples including depression in 60%, social phobia in 40%, generalized anxiety disorder in 30% and personality disorder in 43%. Several physical problems have also been noted for Type D personality including myofascial pain, fibromyalgia, migraine headaches and insomnia. Diseases that have been associated with Type D personality include infertility, skin problems, cardiovascular disease, cancer and white matter hyperintensity in the brain. A few buffers and interventions have been the focus of research on Type D personality including self-management, interpretation bias modification, and dyadic coping. Methodological limitations of this literature include that sampling has been limited primarily to clinical populations and those clinical conditions have confounded the effects of type D personality.