Rectal cancer occurs when abnormal cells grow out of control in your rectum.
If the tumor was small and had not spread, your doctor may have removed it during the colonoscopy. But you may need surgery to remove the cancer if the tumor was too big or had spread too far to be removed during a colonoscopy. If cancer has spread to another part of your body, such as the liver, you may need more far-reaching surgery.
Treatment for rectal cancer may also include radiation therapy. Medicines that destroy cancer cells, such as chemotherapy or targeted therapy, may be used. And medicines that work with your body's immune system, called immunotherapy, may also be used. Being treated for cancer can weaken your body, and you may feel very tired. Get the rest your body needs so that you can feel better.