Anorexia nervosa is an eating disorder characterized by an abnormally low body weight, an intense fear of gaining weight, and a distorted perception of body image. The causes of anorexia nervosa are not fully understood, but it is likely that a combination of biological, psychological, and environmental factors contribute to its development. Some of the psychological factors that may contribute to the development of anorexia nervosa include a high level of perfectionism, obsessive-compulsive personality traits, feelings of inadequacy, low self-esteem, anxiety, anger, or loneliness. People with anorexia nervosa may use unusual eating habits to cope with stress, anxiety, and low self-esteem, and limiting food may give them a sense of control over their life. Additionally, individuals with anorexia nervosa have an increased likelihood of developing another mental health disorder, such as depression, anxiety, obsessive-compulsive disorder, or self-harm behavior.