Caution! The words Anorexia and Bulimia alone are not defined as mental conditions.
Anorexia: Anorexia just means seriously underweight. Can be caused by underlying physical or mental condition. Lack of appetite for food. Avoidance of food.
Anorexia Nervosa: Anorexia Nervosa is a mental condition. Refusal to maintain minimum normal body weight. Symptoms can include intense fear of weight gain, distorted body image, inadequate eating. Seriously underweight.
Bulimia: Bulimia just means constant and insatiable craving for food. Can be caused by underlying physical or mental condition. Sometimes seriously overweight. Sometimes seriously underweight, caused by vomiting food.
Bulimia Nervosa: Bulimia Nervosa is a mental condition. Defined by food binges, episodes overeating, loss of control. Vomiting or laxative abuse are used to prevent weight gain. Some but not all, victims of bulimia may suffer from anorexia nervosa. Sometimes seriously underweight.
Eating Disorder caused by a physical condition: Underlying physical condition may cause excessive weight gain or excessive weight loss. May have cravings or aversions to some or all foods. May suffer from indigestion, gas, bloating, full feeling or nausea. May compulsively overeat. May be seriously underweight or overweight.
Eating Disorder caused by a mental condition: Mental condition would primarily be either Anorexia Nervosa, Bulimia Nervosa or Compulsive Overeating. May be seriously underweight or overweight.
Nervosa: Mental condition. Psychological term.
Caution: All known physical conditions must be ruled out by all known medical tests, before a mental condition can be diagnosed.