A colostomy is carried out normally in the case of colorectal cancer, rectal cancer and other cancers associated with the bowel system. A stoma or a hole is made in the abdominal wall, which is connected to the colon for the collection of waste (faeces) from the body. It is mainly done to bypass any surgically treated colon or rectal part. A colostomy bag is situated on the exterior of the abdomen to collect the feces.