Colorectal cancer is cancer that develops in the colon or rectum. It occurs due to uncontrolled cell growth and can be benign or malignant. Risk factors include inflammatory bowel disease, genetic mutations, polyps, diet, environment, and certain genetic syndromes. It is classified using the Duke's or TNM staging systems. Symptoms vary depending on the location but may include abdominal pain, bleeding, fatigue, and changes in bowel habits. Treatment involves chemotherapy, radiation therapy, and surgery such as colectomy or colostomy. Nursing care focuses on managing pain, nutrition, body image, and skin integrity around the stoma.