A colonoscopy can check for appendicitis, and patients will also need to have additional tests such as imaging, laboratory tests, and a physical examination to help confirm the diagnosis of appendicitis. The appendix is located in the ileocecal portion of the large intestine, and colonoscopy can examine lesions from the rectum to the ileocecal area, so the examiner can explore the appendix area by performing a colonoscopy. If pus or fluid is present at the opening of the appendix during colonoscopy, it may be localized to appendicitis. Patients with suspected appendicitis may undergo abdominal CT and abdominal ultrasound, which are imaging tests that can determine whether appendicitis is present and the severity of appendiceal lesions. These tests are often more meaningful than colonoscopy in the clinical diagnosis of appendicitis. Patients are also required to undergo tests such as routine blood tests, which typically reveal a significantly elevated white blood cell count. In addition, patients with appendicitis will present with fixed pressure pain in the right lower abdomen on physical examination. Although colonoscopy can detect appendicitis, it cannot confirm the diagnosis of appendicitis. It is recommended that patients with suspected appendicitis seek prompt medical attention, and the doctor will choose the appropriate test according to the patient’s condition.