Body image disorder refers to a condition in which a person holds unrealistic or excessively negative thoughts about their own physical appearance. This disorder typically involves an overly critical or negative attitude when evaluating one's body. Individuals with body image disorder may become preoccupied with unrealistic thoughts and feelings about their appearance.

Symptoms may include:

Unrealistic body image: Despite having a normal or healthy appearance, the person perceives their body as overweight or unattractive.
Excessively critical attitude: Individuals may hold constant, overly critical or negative thoughts about their body that are often inconsistent with reality.
Low self-esteem and depression: Negative body image may be associated with low self-esteem and depressive symptoms. The person may experience difficulties in social and personal life due to concerns about appearance.
Social isolation: Individuals may avoid interaction with others and tend toward social withdrawal.
Compulsive behaviours: Some people may engage in excessive exercise, extreme dieting, or other compulsive behaviours in an attempt to correct or change perceived flaws.

The causes of this disorder can be complex and are usually related to an interaction of biological, genetic, environmental, and psychosocial factors. It is also frequently seen alongside other mental health conditions such as eating disorders, obsessive-compulsive disorder, depression, and anxiety.

Body image disorder is assessed and diagnosed by a psychiatrist or clinical psychologist. Treatment options may include psychotherapy, support groups, and sometimes medication. The aim of treatment is to improve emotional and mental wellbeing, develop a realistic body image, and strengthen skills for coping with negative thoughts.