Colonoscopy is a diagnostic method used by doctors to check large intestine and colon lesions. Colonoscopy is a slender and flexible instrument with a diameter of about 1 cm. Colonoscopy enters the rectum through the anus until it reaches the large intestine, allowing doctors to observe the internal situation of the colon and large intestine.

Primitive colonoscopy is mostly used for quarantine, which is simpler than modern colonoscopy. Modern colonoscopy is often equipped with a camera, and its size is longer, which can examine the lesion more deeply.

I wish your father a speedy recovery.