Colitis is considered a benign lesion clinically and generally does not transform into cancer. Therefore, patients do not need to worry too much. The diagnosis of colitis mainly relies on colonoscopy. Most patients undergo colonoscopy due to abdominal discomfort or abnormal stools. The abdominal discomfort is primarily in the lower abdomen or lower left abdomen, presenting as pain and distension. Abnormal stools can clinically manifest as changes in the frequency of bowel movements, changes in stool texture to harder or thinner, and so on. Most patients do not exhibit alarming symptoms such as bloody stools, weight loss, or decreased appetite. Colonoscopy is frequently used clinically and can generally serve to differentiate between colitis and colon cancer. Most patients can tolerate a colonoscopy, so there is no need for patients to resist undergoing this examination.