Definition of Bloating and Distension, In the literature, the terms "bloating" and "distension" are largely used synonymously, relying more on patient descriptions rather than on any attempt to record an actual change in girth.
by Richard Lea, MD; Peter J. Whorwell, MD, MedGenMed Gastroenterology, Medscape General Medicine
However, it has recently been suggested that the term "bloating" should be reserved exclusively for the subjective symptom of abdominal enlargement, with the term "distension" being used only when there is an actual change in girth. The situation is further complicated by the fact that in some languages there is not necessarily an exact equivalent of the word "bloating." For the purposes of this review, when a particular study uses the descriptors of either bloating or distension, they are strictly adhered to because there is usually no way of further refining their precise meaning.