A 69-year-old man comes to the physician for a 1-month history of lightheadedness and tightness in his chest with exertion. The pain is worse after arguing with his wife. Hemoglobin is 9 g/dL. Test of the stool for occult blood is positive. Colonoscopy shows no abnormalities. ECG shows left-axis deviation and a left bundle branch block. Which of the following is the most likely explanation for this patient’s anemia?
Adenocarcinoma
Diverticulitis
Diverticulosis
Peutz-Jeghers syndrome
Tortuous vasculature
Whipple disease
