Body image is a person's thoughts, feelings and perception of the aesthetics or sexual attractiveness of their own body. The concept of body image is used in a number of disciplines, including neuroscience, psychology, medicine, psychiatry, psychoanalysis, philosophy, cultural and feminist studies; the media also often uses the term. Across these disciplines, there is no single consensus definition, but broadly speaking body image consists of the ways people view themselves; their memories, experiences, assumptions, and comparisons about their own appearances; and their overall attitudes towards their own respective heights, shapes, and weights—all of which are shaped by prevalent social and cultural ideals.

Body image can be negative ("body negativity") or positive ("body positivity"). A person with a negative body image may feel self-conscious or ashamed, and may feel that others are more attractive. In a time where social media holds a very important place and is used frequently in our daily lives, people of different ages are affected emotionally and mentally by the appearance and body size/shape ideals set by the society they live in. These standards created and changed by society created a world filled with body shaming; the act of humiliating an individual by mocking or making critical comments about a person's physiological appearance. There are differences of body shaming someone and yourself, according to anad.org "We are our own worst critic" which means that we judge and see our own flaws more than anyone else. We body shame ourselves by judging or comparing ourselves to someone else.

Aside from having low self-esteem, sufferers typically fixate on altering their physical appearances. Such behavior creates body dissatisfaction and higher risks of eating disorders, isolation, and mental illnesses in the long term. In Eating Disorders, a negative body image may also lead to body image disturbance, an altered perception of the whole one's body. Body dissatisfaction also characterizes body dysmorphic disorder, an obsessive-compulsive disorder defined by concerns about some specific aspect of one's body (usually face, skin or hair), which is severely flawed and warrants exceptional measures to hide or fix. Often, people who have a low body image will try to alter their bodies in some way, such as by dieting or by undergoing cosmetic surgery. On the other hand, positive body image consists of perceiving one's figure clearly and correctly, celebrating and appreciating one's body, and understanding that one's appearance does not reflect one's character or worth.

Many factors contribute to a person's body image, including family dynamics, mental illness, biological predispositions and environmental causes for obesity or malnutrition, and cultural expectations (e.g., media and politics). People who are either underweight or overweight can have poor body image. However, when people are constantly told and shown the cosmetic appeal of weight loss and are warned about the risks of obesity, those who are normal or overweight on the BMI scale have higher risks of poor body image. "We expected women would feel worse about their bodies after seeing ultra-thin models, compared to no models if they have internalized the thin ideal, thus replicating previous findings."

A 2007 report by the American Psychological Association found that a culture-wide sexualization of girls and women was contributing to increased female anxiety associated with body image. An Australian government Senate Standing Committee report on the sexualization of children in the media reported similar findings associated with body image. However, other scholars have expressed concern that these claims are not based on solid data.