Bloated Abdomen: Causes of Bloating and When It Is a Cause for Concern

Your abdomen is bloated by evening, your belt is tight, and a list of scary diagnoses is already spinning in your head — or the thought "it will pass on its own." Let's sort this out without panic and without advertising promises of a "detox": what is called bloating, where it comes from, and when it's time to stop googling and see a doctor.

What abdominal bloating is and how it feels

Bloating is a subjective sensation of gas, pressure, or distension in the abdomen. It is specifically a sensation: from the outside the abdomen may look normal, while inside everything feels stretched.

The symptoms most often reported:

• the abdomen feels full or larger than usual;
• pain or discomfort in the abdomen;
• rumbling and sounds in the abdomen;
• more gas than usual.

And right away about what's normal: everyone has gas. On average, a person passes it 13–21 times a day — through the mouth (belching) and through the anus. The odor is not caused by the gases themselves but by colonic bacteria that release small amounts of sulfur compounds.

Bloating is common: in the general population, 16–31% of people report it, and in irritable bowel syndrome, 66–90%.

Why the abdomen bloats: common causes

The most common mechanism is a lot of gas in the intestines. There are two sources: air that we swallow while eating, and the breakdown of undigested food by colonic bacteria. Hence bloating from sauerkraut: vegetables, legumes, and carbonated drinks are typical triggers. At the same time, food that bloats one person passes unnoticed in another.

The second layer is digestive problems: constipation, food intolerance, celiac disease, irritable bowel syndrome.

There are also organic causes that a doctor looks for: small intestinal bacterial overgrowth, lactose or fructose intolerance, pancreatic insufficiency, gastroparesis, gastric outlet obstruction, ascites, hypothyroidism, obesity, malignant neoplasms.

A separate group is disorders of the gut–brain interaction: IBS, chronic idiopathic constipation, pelvic floor dysfunction, functional dyspepsia, and functional bloating.

And the promised myth-busting. Most people believe the cause is excess gas, but this explains symptoms in only a minority. That is why the cause of bloating is determined by a doctor.

Bloating in women

In women, some episodes are linked to the cycle: some feel distension before menstruation. The most serious point is that persistent bloating that does not go away may be a sign of ovarian cancer. Therefore, bloating that does not go away is not a cosmetic complaint.

What examinations are prescribed for bloating

If bloating is regular, the doctor investigates the cause rather than the symptom. Possible examinations include: breath tests, celiac serology, gastroscopy, imaging of the abdominal organs, assessment of gastrointestinal function, and anorectal function testing.

Then, based on the result: some are referred to a dietitian, others to a specialist for further evaluation. Treatment, if needed, is tied to the cause found.

Warning signs: when to see a doctor

See a doctor routinely if: bloating is bothersome regularly, dietary changes have not helped, there is unintentional weight loss, or there is blood in the stool.

Seek medical attention urgently (without delay) if: bloating occurs together with vomiting, diarrhea, or constipation; with abdominal pain; with high fever and chills; with swelling or a lump in the abdomen; with inability to urinate, have a bowel movement, or pass gas; with burning in the chest due to acid reflux.

Bloating by itself is not a reason to call an ambulance; 103/112 — if the abdomen is bloated and there is severe sudden pain, vomiting blood or vomit that looks like coffee grounds, or severe difficulty breathing — the person is gasping and cannot speak.

This text is for reference: it helps you get your bearings and ask your doctor the right questions, but it does not replace a consultation with a specialist.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer