The 2019 coronavirus disease pandemic was declared on March 11, 2020. It has caused an unprecedented global health crisis. At the same time, people suffering from inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis, face the challenges of their own chronic diseases. They are already being treated and monitored for their specific health conditions, but the question arose of how this pandemic could affect the course of their inflammatory bowel diseases, and the development of new cases of the disease. The main goal of this thesis is to examine the difference in the number of people diagnosed with inflammatory bowel diseases, specifically Crohn's disease and ulcerative colitis, before and after the declaration of the 2019 coronavirus pandemic. For the purposes of this thesis, a retrospective study was conducted within the hospital information system (BIS) of the Karlovac General Hospital. Data on the number of patients diagnosed with inflammatory bowel diseases (Crohn's disease and ulcerative colitis) who were treated at that institution were extracted from the system. The research included 368 patients suffering from inflammatory bowel diseases who were treated between March 2017 and March 2023. The results proved that of the total number of people included in the research, 54% were treated before the declaration of the COVID-19 pandemic, which did not prove a direct connection between the COVID-19 pandemic and inflammatory bowel diseases. Also, the results showed that there is no gender predominance among people diagnosed with inflammatory bowel disease, that the majority of people are over 40 years old, and that the vast majority, or 79%, live in urban areas.