I am a 30-year-old woman who has recently noticed changes in my bowel habits. I experience loose stools approximately once every two weeks and often feel the need to have a bowel movement shortly after eating. I do not have any blood in my stool, but I do experience intermittent lower abdominal pain. Last year, I had this pain (feels like menstrual cramping) on two occasions and underwent two abdominal ultrasounds, both of which were normal. However, this year the symptoms have returned, and I am now experiencing a persistent dull ache in my lower abdomen and lower back. Could these symptoms be suggestive of a gastrointestinal cancer? Should I undergo evaluation for colon cancer?