How does muscle dysmorphia relate to body dysmorphic disorder?

Body dysmorphic disorder is a condition characterized by a general obsession with appearance, with sufferers usually focusing on a small defect or series of defects (either real or imaginary) that they believe ruins their appearance. This obsession with personal defects interferes with normal daily functioning. Muscle dysmorphia is considered a type of body dysmorphic disorder. While body dysmorphic disorder is more frequently found in women, muscle dysmorphia is more common in men and is defined by the specific, obsessive belief that one is not muscular enough.