In the literature, the majority of the patients had a history of consuming raw or uncooked fishes, and this is a crucial factor of intestinal Capillaria infection. However, nearly half of the Taiwanese patients (14 of 30 cases) denied having consumed any raw or undercooked fishes. We propose that the infection may occur when the ingested food is contaminated by uncooked visceral contents of infested fish. Therefore, whether patients have consumed raw or uncooked fish ought to be taken into consideration but should not be the basis for ruling out the possibility of intestinal capillariasis.