system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 26-year-old woman presents to the office complaining of bloating and consistent fatigue. Past medical notes on her record show that she has seen several doctors at the clinic in the past year for the same concerns. During the discussion, she admits that coming to the doctor intensifies her anxiety and she does not enjoy it. However, she came because she fears that she has colon cancer and says, “There’s gotta be something wrong with me, I can feel it.” Past medical history is significant for obsessive-compulsive disorder (OCD). She sees a therapist a few times a month. Her grandfather died of colon cancer at 75. Today, her blood pressure is 120/80 mm Hg, heart rate is 90/min, respiratory rate is 18/min, and temperature is 37.0°C (98.6°F). Physical examination reveals a well-nourished, well-developed woman who appears anxious and tired. Her heart has a regular rhythm and her lungs are clear to auscultation bilaterally. Her abdomen is soft, non-tender, and non-distended. No masses are palpated, and a digital rectal examination is unremarkable. Laboratory results are as follows:
Serum chemistry 
Hemoglobin 13 g/dL 
Hematocrit
38%
MCV 90 fl
TSH
4.1 μU/mL
Fecal occult blood test  negative
Which of the following is the most likely diagnosis?
assistant
Illness anxiety disorder