Hi my mom has colo rectal cancer and she has undergone chemotherapy and radiation 9 weeks before. the date of surgery is on 12 th july. But now though we are waiting for the surgery date but my mom is facing gas formation issue , regarding stool passing
You mother probably has landed up in irritable bowel syn Chat Doctor.  Radiation can also cause increased frequency of stools and irritation of gut but that doesn't last long. Her symptoms are not permanent, and she would get better as time passes by. All she needs to do is to take frequent small meals with good nutritious value, low fiber diet and not to get upset. You can seek the advice of your physician regarding supportive medications