- Take the Tummy Trouble Quiz
- Digestive Disease Myths Slideshow Pictures
- Ulcerative Colitis Slideshow
- Patient Comments: Intestinal Gas - Effective Treatments
- Patient Comments: Intestinal Gas - Causes
- Patient Comments: Intestinal Gas - Bloating Causes
- Patient Comments: Intestinal Gas - Flatulence Causes
- Intestinal gas facts
- What causes belching (burping)?
- What causes bloating?
- What causes flatulence (gas)?
- What are the causes of intermittent abdominal bloating/distention?
- How are belching, bloating/distention, and flatulence evaluated?
- What is the treatment for intestinal gas?
- What's new in intestinal gas?
Quick GuideDiarrhea and Digestive Distress Pictures Slideshow: Problem Foods to Avoid
What causes bloating?
It is important to distinguish between bloating and distention.
- Bloating is the subjective sensation (feeling) that the abdomen is full or larger than normal. Thus, bloating is a symptom akin to the symptom of discomfort.
- In contrast, distention is the objective determination (physical finding) that the abdomen is larger than normal. Distention can be determined by such observations as the inability to fit into clothes, the need to loosen the belt or looking down at the stomach and noting that it is clearly larger than normal.
In some instances, bloating may represent a mild form of distention since the abdomen does not become physically (visibly or measurably) enlarged until its volume increases by one quart. Bloating and even mild cases of distention may be caused by relaxation of the muscles of the abdominal wall and downward movement of the diaphragm.
There are three ways in which abdominal distention can arise. The causes are an increase in air, fluid, or tissue within the abdomen. The diseases or conditions that cause an increase of air, fluid, or tissue are very different from one another. Therefore, it is important to determine what (air, fluid, tissue) is distending the abdomen.
There are two types of distention; continuous and intermittent.
- Continuous distention may be caused by the enlargement of an intra-abdominal (within the abdomen) organ, an intra-abdominal tumor, a collection of fluid within the peritoneal cavity, the space that surrounds the intra-abdominal organs (ascites), or just plain obesity.
- Intermittent distention is usually due to the accumulation of gas and/or occasionally, fluid within the stomach, small intestine, or colon.