[Solved]: A 35-year-old man believes he has colon cancer

A 35-year-old man believes he has colon cancer. He reports that his “peristalsis is louder than usual” and he has “excessive flatulence.” He shows you a logbook that he has been keeping of his bowel habits for the last 6 months. He reports no weight loss, fatigue, diarrhea, constipation, night sweats, blood in his stool, or family history of colon cancer. He is having difficulty sleeping. His vital signs are within normal limits, and his weight is unchanged from the last visit. Physical exam reveals a nontender abdomen without bloating. No masses are palpated. Which of the following is the most likely diagnosis? Functional neurological symptom disorder Generalized anxiety disorder Illness anxiety disorder Irritable bowel syndrome