Anorexia nervosa (AN) is the third most common disorder, after obesity and asthma, in the population of adolescents between 13–18 years of age. Food intake reduction is associated with whole body dysfunction, affecting its physical, psychological and social spheres. As a result of starvation, dysfunction develops in virtually all systems and organs. However, most frequently patients with AN complain of digestive symptoms, such as a feeling of fullness after meals, pain in the upper abdomen, dysphagia, nausea, bloating and constipation. They can have mild functional character, but may also reflect serious complications, including diseases requiring urgent surgical intervention. In addition, gastric complaints may hinder nutritional management of AN. Care of AN patients requires cooperation of many specialists in the field of psychiatry, psychology, paediatrics, internal medicine and nutrition. However, it is often difficult to organize such a team. Therefore, we decided to approach the issues of gastrointestinal symptoms and complications in the course of AN, and the rules of nutritional therapy.