Anorexia Nervosa is an eating disorder that frequently sets on during adolescence, and largely affects female. It is well known that various factors play a role in the etiology of anorexia nervosa, such as social and familial interactions and psychodynamic factors. Pseudocyesis is defined by DSM-5 as a false belief of being pregnant that is associated with objective signs and reported symptoms of pregnancy, which may include abdominal enlargement, reduced menstrual şow, amenorrhea, subjective sensation of fetal movement, nausea, breast engorgement and secretions and labor pains at the expected date of delivery. Cases of pseudocyesis are found more frequently in rural undeveloped countries, and the etiology of pseudocyesis is still unclear. Most of the currently accepted causality theories emphasize on interaction between psychologic factors and the reproductive system, probably mediated by hormonal inşuences. In this case report, the definitive features and process of anorexia nervosa and pseudocyesis were discussed. A 23-year-old female, who was admitted to our hospital for further investigation of secondary amenorrhea and bulging belly with weight loss of ten kilos. The sexual and physical development of patient was normal. Her menarche was reported at the age of 14. When 22 years old, she experienced amenorrhea first after the death of her father. We would like to add this as an important information that she has got an intrusive mother. When first seen in epicentral clinic in October 2011, she complained of nausea with vomiting, she lost 10 kilos in 6 months (She was 51 kg at first, and her BMI (Body Mass Index) was 20) But she was having an intense fear of gaining weight and was perceiving her body as overweight. At that time she had abdominal pain, she recounted having experienced tiredness, loss of appetite, sleeping excessively, vomiting after food intake, breast enlargement, changes around her nipples and feeling fetal movement. Clinical assessment at the obstetrics confirmed a normal female; there was no hirsutism, galactorrhea or abdominal pigmentation. Gastrointestinal endoscopy, colonoscopy, muscle biopsy, abdominal CT, cranial MR, pituitary MR were examined under custody of gynecologist, endocrinologist and gastroenterologist. All of the test results and routine biochemical panel were within the normal range. In the treatment of the patient, psychotherapy techniques complemented with medication (Sertraline 100 mg/day) were thought to be useful. The patient became aware of the unfavourable relationship, improved and gained emotional cognitive insight. There appear to be many grades and types of pseudocyesis and anorexia nervosa, so that these syndromes cannot be regarded as a uniform entity with a single explanation. Here we have a woman, whose history demonstrates a considerable insecurity in the feminine role, deriving from a disturbed relationship with her mother. In the etiology of anorexia nervosa, psychodynamic factors have considerable importance and in this case, social and familial interactions contribute to the development of anorexia nervosa. Pregnancy could be used to magically avoid being abandoned and helpless. Loss of love, loss of a love object, or loss of fertility is postulated to operate in the development of pseudocyesis. We report a case of pseudocyesis secondary to anorexia nervosa. To the best of our knowledge, this is the first report of anorexia nervosa comorbid to pseudocyesis.