A stomach rumble, also known as a bowel sound, peristaltic sound, abdominal sound, bubble gut or borborygmus (pronounced ; plural borborygmi), is a rumbling, growling or gurgling noise produced by movement of the contents of the gastro-intestinal tract as they are propelled through the small intestine by a series of muscle contractions called peristalsis. A trained healthcare provider can listen to these intestinal noises with a stethoscope, but they may be audible enough to be heard with the naked ear as the fluid and gas move forward in the intestines (in the vicinity of, but not actually within the stomach). The lack of bowel sounds is indicative of ileus, intestinal obstruction, or some other serious pathology. Etymology
The scientific name borborygmus is related to the 16th-century French word borborygme, itself from Latin, ultimately from Ancient Greek βορβορυγμός (borborygmós). The Greeks probably onomatopoetically coined the word. Other causes
Other causes of stomach rumbles:

Incomplete digestion of food can lead to excess gas in the intestine. In humans, this can be due to incomplete digestion of carbohydrate-containing foods, including milk and other dairy products (lactose intolerance or the use of α-glucosidase inhibitors by diabetics), gluten (protein in wheat, barley, and rye) (coeliac disease), fruit, vegetables, beans, legumes, and high-fiber whole grains. In rare instances, excessive abdominal noise may be a sign of digestive disease, especially when accompanied by abdominal bloating, abdominal pain, diarrhea or constipation. Some examples of diseases that may be associated with this symptom include carcinoid neoplasm and coeliac sprue. Louder rumbles may occur when one is hungry.
Ruskin reported in his diaries having visual disturbances consistent with the disease, and it has also been suggested that it might have been a factor in causing him to describe James Whistlers Nocturne in Black and Gold – The Falling Rocket as "ask[ing] two hundred guineas for throwing a pot of paint in the publics face". This resulted in the famous libel trial that resulted in a jurys awarding Whistler one farthing damages.Recent research into the illness of philosopher Friedrich Nietzsche has suggested that his mental illness and death may have been caused by CADASIL rather than tertiary syphilis. Likewise, the early death of the composer Felix Mendelssohn, at age 37, from a stroke has been potentially linked to CADASIL. His sister, Fanny Mendelssohn, was similarly affected. And James Dewar, best known as vocalist for Robin Trower, died age 59 from complications of CADASIL.In the movie The Sea Inside, one of the characters is stated to have CADASIL. See also
Proteopathy
CARASIL (cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy)

References
Further reading
Lesnik Oberstein SA, Boon EM, Terwindt GM (June 28, 2012). CADASIL. University of Washington, Seattle. PMID 20301673. NBK1500. In Adam MP, Everman DB, Mirzaa GM, Pagon RA, Wallace SE, Bean LJH, Gripp KW, Amemiya A (1993). Pagon RA, Bird TD, Dolan CR,  et al. (eds.). GeneReviews [Internet]. Seattle WA: University of Washington, Seattle. PMID 20301295. External links
A patient story at The New York Times