If it is colitis, the patient has symptoms such as loose stools, increased frequency of defecation, and unformed stools. In such cases, it is first recommended to visit the gastroenterology department. After an interview and physical examination by a doctor, a colonoscopy can be performed based on the patient's condition to clarify the diagnosis. If the patient has symptoms such as rectal bleeding, abdominal pain, and anemia in addition to the above, they can visit either the gastroenterology department or the general surgery department. Generally, the examinations for colitis include stool tests and colonoscopy. Therefore, when going to the hospital, if the patient has colitis, the first choice should be the department of gastroenterology.