Gastroenteritis refers to inflammation of the stomach and intestines, and is characterised as viral gastroenteritis when the inflammatory condition is caused by infection with a virus. Viral gastroenteritis is often called the ‘stomach flu’ because it is caused by a virus, even though the influenza virus is not one of them.

Anorexia nervosa is a severe emotional, eating disorder that is characterised by a misperception of body image. Individuals suffering from anorexia nervosa have a distorted body image, which means that while they may be extremely underweight, they believe they are overweight. Sufferers also often have an obsessive fear of gaining weight. In popular media anorexia nervosa is shortened to anorexia. It should be noted that anorexia refers simply to having a loss of appetite, while anorexia nervosa is an emotional disorder that leads to appetite suppression.