Anorexia usually occurs stealthily, and gradually anorexia leads to weight loss, with 1/4- 1/2 or more of the original weight lost, and at the same time amenorrhea will occur. It is skinny in severe cases, but the physical strength is still abundant, and amenorrhea does not lose pubic hair, which is the characteristic of this disease and can be used to treat hypopituitarism (Simmond disease). But later, there may be fatigue, tiredness and melancholy. Patients may not necessarily have anorexia at first, but just refuse to eat for various reasons. Although some patients have a good appetite, they feel that their stomachs are full and uncomfortable after eating a few bites, or they don't want to eat when they see food. If they are forced to eat, they often induce nausea and vomiting. Some patients even try their best to induce vomiting. In addition to anorexia, patients may also have other symptoms of neurosis, such as hysteria, fullness and discomfort in the upper abdomen, unexplained fatigue, lack of interest in sexual desire and insomnia. 1, patients pay too much attention to diet and worry about getting fat, but actively refuse to eat or go on excessive diet, resulting in emaciation, malnutrition, and dry skin. It is also believed that this is "the beauty of bone feeling", and only such worry and control can have such an effect. 2. Patients often feel hungry, but they force themselves not to eat. They are good at studying the nutrition and calories of food; Hiding or deliberately wasting food. About 50% of anorexics are accompanied by bulimia, and after overeating, they induce vomiting, take diet pills, laxatives, etc., or do a lot of exercise for fear of gaining weight, which leads to water-electrolyte disorder (hypokalemia, hyponatremia, etc.) and acid-base imbalance (metabolic alkalosis). 3. Women's menorrhagia is reduced or stopped, and both men and women have a lack of sexual desire; 4, heart function decline, slow heart rate, blood pressure drop, arrhythmia, leading to sudden death; Decreased heart blood flow and insufficient blood supply to cerebral vessels are easy to cause syncope. 5. Weight is obviously reduced and edema appears; Abnormal hormone levels in the body, resulting in thin hair or excessive body hair, etc. 6. Patients are often accompanied by personality changes, such as depression, anxiety, moodiness, compulsion or repeated doing something; Often lie, hide their eating habits, etc. The main symptom of anorexia patients is that they are not interested in food and have no appetite to eat heartily. The patients' thoughts are far from the actual situation, and they always feel fat even though they are thin. According to the standard diagnosis of American Psychiatric Association, the weight of anorexia patients is often lower than the standard BMI15%.