muscle dysmorphia
nounMedical Definition of muscle dysmorphia
: pathological preoccupation with the perceived smallness or weakness of one's body and musculature often leading to excessive exercise (such as bodybuilding), steroid abuse, or eating disorders
A typical sufferer of muscle dysmorphia is a man who weighs himself several times a day, compulsively examines himself in the mirror, and fails at relationships because he is unwilling to devote time or energy to others …— Eileen Smith, USA Today, 24 Nov. 1997 … researchers from Boston's McLean Hospital compared 30 normal weightlifters to 24 men with muscle dysmorphia—a disorder defined by a pathological preoccupation with increasing muscularity.— Kelly McCarthy, Psychology Today, January/February 2001
— called also bigorexia, reverse anorexia
— see body dysmorphic disorder