Muscle dysmorphia

Muscle dysmorphia is a form of body dysmorphic disorder (BDD) first described in a group of bodybuilders. Like other people with body dysmorphic disorder, people with muscle dysmorphia perform repetitive behaviours because of concerns about their appearance, and they experience significant distress or impairment of day-to-day activities. The distinguishing characteristic of the muscle dysmorphia specification of body dysmorphic disorder is that the person is concerned that their body is too small or not muscular enough (often, but not always, with accompanying concerns about other parts of their body).

Most people with muscle dysmorphia use diet, exercise and/or weightlifting, often excessively, to address their concerns, and therefore have normal or very muscular physiques2.

Muscle dysmorphia is more prevalent in males than females, with some studies suggesting the disorder occurs exclusively in men1, . However, a recent study of Australian adolescents (representative of the population) indicates that muscle dysmorphia is present in 2.2% of males and 1.4% of females, with no ‘statistically significant’ gender difference in prevalence.

Australian adolescent males have a higher drive for muscularity than females, and those with muscle dysmorphia are more likely than their female counterparts to have a severe preoccupation with their perceived lack of muscularity and have weight training interfere with their daily life4. Australian boys and young men experience less discomfort from others seeing their bodies than their female peers.

There are reasons to suspect that men and boys are unlikely to seek help for muscle dysmorphia, which is particularly worrying given that people with the disorder have high rates of substance use, suicidality and other psychiatric problems4. Australian data show that Australian boys aged 14-15 years are less likely than girls to seek help for personal or emotional problems, but individuals with muscle dysmorphia may not have insight into their disorder.

Recognition of muscle dysmorphia in males can be difficult because characteristic behaviours (e.g. diet and exercise) may be mistaken as beneficial to the person’s health. A series of questions to determine the presence of muscle dysmorphia in athletes has been proposed, relating to the social effects, time costs and behaviours associated with diet and exercise:


Social avoidance

  • How often have your relationships with others been affected by your exercise and diet regimens?
  • Do your concerns about your appearance influence your school or career performance? Do you miss out on opportunities to progress because of your self-consciousness?
  • Do you frequently miss school or work or avoid social activities because of your appearance concerns?
  • What measures do you take to avoid showing your body to others? Do you pass up chances to participate in sports because you will have to change clothes in front of people? Do you often wear baggy clothes or hats to hide your body or face?
  • Do your concerns about your appearance affect your sex life?



  • What portion of each day do you spend grooming yourself?
  • How much time is spent daily on exercises with the specific intent of bettering your appearance (e.g., abdominal exercises, weightlifting) rather than improving your performance in sport?
  • How much of your day is taken up with actively worrying about your appearance?
  • How frequently does your appearance make you feel distraught, depressed, or anxious?


Diet and other practices

  • How commonly do you diet, ingest certain foods (e.g., low-fat, low-carbohydrate, or high-protein foods), or take supplements with the explicit aim of enhancing your appearance?
  • What portion of your salary or other income is devoted to items and practices (e.g., exercise equipment or classes, grooming supplies, surgery, special foods or dietary aids) to better your physical appearance?
  • Have you at any time taken a drug (lawful or not) to drop weight or increase muscle mass?
  • Aside from drugs, have you pursued other methods of enhancing your appearance, such as overexercising or attempting your normal training regimen despite an injury; fasting, purging, or other detrimental nutritional activities; or unproven methods for growing hair, increasing muscle mass, or enlarging the penis?


Effective management of body dysmorphic disorder, including muscle dysmorphia, requires psychotherapy, in some cases with pharmacological treatment. This provides the best chance of avoiding the functional impairments and psychiatric comorbidities that characterise and accompany muscle dysmorphia.

A/Prof Tim Moss
A/Prof Tim Moss

Associate Professor Tim Moss has PhD in physiology and more than 20 years’ experience as a biomedical research scientist. Tim stepped away from his successful academic career at the end of 2019, to apply his skills in turning complicated scientific and medical knowledge into information that all people can use to improve their health and wellbeing. Tim has written for and Scientific American’s Observations blog, which is far more interesting than his authorship of over 150 academic publications. He has studied science communication at the Alan Alda Centre for Communicating Science in New York, and at the Department of Biological Engineering Communication Lab at MIT in Boston.


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