The four main types of bowel sounds, categorized by frequency and intensity during a physical exam, are Normal (Normoactive) (5-30 gurgles/clicks per minute), Hypoactive (reduced, less than 5/min), Hyperactive (increased frequency/intensity, >30/min, often loud gurgling/rumbling), and Absent (no sounds heard after listening for 2-5 minutes), with high-pitched tinkles sometimes noted for obstructions. These classifications help doctors assess digestive activity, with hypoactive/absent sounds suggesting slowed movement and hyperactive sounds indicating increased motility or irritation.
Decreased or absent bowel sounds often indicate constipation. Increased (hyperactive) bowel sounds can sometimes be heard even without a stethoscope. Hyperactive bowel sounds mean there is an increase in intestinal activity. This may happen with diarrhea or after eating.
Symptoms of bowel obstruction include:
The stethoscope is used to listen over several areas of the abdomen for several minutes for the presence of bowel sounds. The diaphragm of the stethoscope should be applied to the abdominal wall with firm but gentle pressure.
Normally, bowel sounds are present in all four quadrants. This means that peristalsis is occurring and contents are moving through the intestines. Only document the absence of bowel sounds after listening in each quadrant for five minutes.
In the instance where you experience hypoactive or hyperactive bowel sounds with persistent symptoms of pain, diarrhoea, nausea, vomiting and constipation, you should consider seeking advice from your GP.
The four cardinal symptoms of bowel obstruction are pain, vomiting, obstipation/absolute constipation, and distention. Obstipation, change in bowel habits, complete constipation, and abdominal distention are the predominant symptoms in LBO.
Abdominal auscultation results
Normal bowel sounds make a low-pitched, gurgling noise. The noise occurs every five to 10 seconds as your intestines push food through your system. This means your gastrointestinal (GI) tract is functioning properly.
He or she will also do a physical exam to assess your situation. The doctor may suspect intestinal obstruction if your abdomen is swollen or tender or if there's a lump in your abdomen. He or she may listen for bowel sounds with a stethoscope.
What is borborygmi? Borborygmi refers to the characteristic growling or rumbling sounds that the stomach and intestines make as food, fluids, and gas pass through them. In general, when food or fluids are ingested, they travel through the esophagus to the stomach, where they then enter the small and large intestines.
An obstruction typically feels like severe cramping pain in your abdomen. The pain from a small bowel obstruction is more likely to come in short intermittent waves, occurring every few minutes or so. The pain is more likely to feel concentrated in one place.
The 3-6-9 rule is a guideline for interpreting abdominal X-rays to detect bowel obstruction, stating normal upper limits are 3 cm for the small bowel, 6 cm for the large bowel (colon), and 9 cm for the cecum; diameters exceeding these suggest dilation, a key sign of obstruction, with larger measurements increasing the risk of rupture (e.g., >6cm small bowel, >9cm cecum).
Pseudo-obstruction
Loud bowel sounds may occur with changes of intestinal function. Common conditions causing this are dyspepsia and irritable bowel syndrome (IBS). Dyspepsia is a condition with indigestion and upper abdominal discomfort. IBS is a common GI condition characterized by changes in bowel habits and abdominal discomfort.
Occasionally you may experience loud stomach gurgling as a part of digestion. However, if loud bowel sounds are frequent or they persist, you may need to see a doctor to investigate your gut health further.
Healthcare providers diagnose a distended abdomen in terms of the “five 'f's”: flatus (gas), fetus (pregnancy), feces (trapped poop), fluid (from several causes) or fat.
Bowel obstructions usually cause cramping abdominal pain, vomiting and inability to pass bowel motions (faeces or poo) or gas. A bowel obstruction is an emergency and needs treatment in hospital to prevent serious complications. You may need surgery or another procedure to remove the blockage.
The most common symptoms of fecal impaction are as follows: Abdominal pain (often after meals) The ongoing urge to pass stool. Liquid stool (most often means stool is leaking around the impacted mass)
Stercoral colitis occurs when a patient has chronic constipation leading to stagnation of fecal matter. This leads to an increase in volume, impaction, and eventual deformation of the colon. Fecaloma consists of hardened fecal material form, which becomes lodged in certain colonic areas.
Very high-pitched bowel sounds can be associated with mechanical obstruction, such as a small bowel obstruction. Small obstructions increase the volume and frequency of bowel sounds. Table 1. Pitch and frequency of bowel sounds under normal conditions, with an ileus, and when a small bowel obstruction is present.
Hyperactive bowel sounds are loud, frequent abdominal sounds like growling and rumbling. They often mean increased intestinal activity—usually after eating, having gas, or experiencing diarrhea. Hyperactive bowel sounds can also be a sign of celiac disease, food intolerances, IBD, GI infection, or bowel obstruction.
The upper limit of normal diameter of the bowel is generally accepted as 3cm for the small bowel, 6cm for the colon and 9cm for the caecum (3/6/9 rule).
Signs and symptoms of bowel obstruction — colicky abdominal pain, absolute constipation (no stool or flatus), bilious vomiting, and hyperactive or tinkling bowel sounds.
Symptoms of a bowel perforation include: