Ulcer disease is limited damage to the mucous membrane of the digestive system. Ulcers can appear on parts of the digestive tract where there is activity of gastric acid, which are mainly the esophagus, stomach and duodenum. Ulcer disease is one of the most common diseases of the gastrointestinal system. The prevalence of peptic ulcer in the general population is approximately 5 to 10%. Ulcers occur due to a disturbance in the balance between protective and aggressive mechanisms acting on the mucous membrane of the digestive system. There is a linear or round defect in the mucous membrane of the digestive system that penetrates through the muscularis mucosa. The most common causes of ulcer disease are Helicobacter pylori infection, chronic stress and consumption of ulcerogenic drugs (non-steroidal anti-rheumatic drugs and acetylsalicylic acid). The diagnosis of peptic ulcer is established by endoscopic examination. It is important to determine whether there is an H. pylori infection using a series of invasive and non-invasive diagnostic methods. Ulcer disease presents with dyspepsia, which can be accompanied by nausea, vomiting, heartburn and a feeling of fullness after a meal. However, many patients do not have developed symptoms of peptic ulcer, so ulcer disease is diagnosed in them when complications appear. In the treatment of ulcer disease, in addition to pharmacotherapy (anti-secretory anti-ulcer drugs), the right choice of food and drink is also very important. Patients are advised to avoid foods that cause dyspepsia. The nurse, in cooperation with other members of the multidisciplinary team, directs the patient to a proper diet, participates in diagnostic procedures and applies the prescribed therapy. The nurse monitors and assesses the patient's state of health and determines problems in the field of health care, which she solves using the prepared health care plan