The relationship between Obsessive-Compulsive Disorder (OCD) and Body Dysmorphic Disorder (BDD) is unclear and some psychiatrists think that BDD is part of the same family, or even a variation of OCD. A U.S. study of 295 people compared those with OCD, those with BDD and those with both conditions. The groups were fairly similar demographically, became ill at about the same age and suffered for about the same amount of time. However, people with BDD had poorer insight than those with OCD and were more likely to be delusional. Subjects with BDD were also significantly more likely than those with OCS to have suicidal thoughts, depression and substance abuse problems.
Phillips, Katherine A. ... [et al] - Obsessive-Compulsive disorder versus Body Dysmorphic Disorder : a comparison study of two possibly-related disorders Depression and Anxiety 24(6), 399-409