Noninterventional Observational Prospective Longitudinal Study of the Incidence of Ulcerative Colitis and Crohn's Disease Among the Adult Population of the Republic of Kazakhstan

Inclusion Criteria: * Availability of a signed informed consent form; or the presence of a disinterested witness if the patient is unable to examine and sign the consent form due to illiteracy or disability (for example, in the case of blindness); * The patient has a documented diagnosis of ulcerative colitis or Crohn's disease (endoscopy, histology, if indicated by radiation diagnostics); * Patients who have applied for treatment or are already taking treatment from a gastroenterologist / coloproctologist, including inpatients; * Citizenship of the Republic of Kazakhstan (or resides). Exclusion Criteria: * Patient takes part in an interventional clinical trial; * Patient is unable to follow the schedule of the visits; * Any condition that the PI believes would prevent a study participant from participating in the study.