From wiki,
Borborygmus (plural borborygmi) is the rumbling sound produced by
the movement of gas through the intestines of animals or humans.
The word borborygmus is an actual onomatopoeia for this
rumbling.
The "rumble" or "growl" sometimes heard from the stomach is a
normal part of digestion. It originates in the stomach or upper
part of the small intestine as muscles contract to move food and
digestive juices down the gastrointestinal tract.
Although this muscle contraction happens whether or not food is
present, rumbles are more common after the animal has gone several
hours without eating. This may be why a "growling" stomach is often
associated with hunger.
Rumbles may also occur when there is incomplete digestion of food
that 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) (celiac disease), fruits, 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. An example of a disease that may be
associated with this symptom are carcinoid tumors.
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Perhaps it's just a simple case of indigestion.
If it's excess gas, try eating ginger/onion.
Also, eat more fibre in your meals... It may help...
