Roux-en-Y patients have symptoms that vary from almost none to inability to tolerate oral feedings. This study was designed to determine whether there is a relationship between a patient's symptoms and the function of the gastric remnant or the Roux-limb. Gastric remnant and Roux-limb emptying were studied in eight patients with technetium-99m-labeled oatmeal and Roux-limb motor activity was measured with a water-perfused manometry system. We found that gastric emptying was rarely significantly slowed, but emptying of the Roux-limb was delayed in several patients. We also found that there was a rough correlation between the patient's symptoms and the degree of abnormal motility found in the Roux-limb. There is no known reason for these abnormalities in Roux-limb function in some patients after a Roux-en-Y, but our finding of worse abnormalities in those who had multiple previous gastric surgeries suggests that the symptoms and dysfunction may be related to the number of surgeries, as well as to the type of surgery.