Bloating after every meal: causes, red flags and when to get it checked

Bloating is a feeling of tight fullness that may or may not come with visible swelling of the abdomen. It can come from more gas, slower movement of gas through the bowel, a more sensitive gut that perceives normal gas as discomfort, or fluid. After meals the bowel is active, so symptoms peak.

• Irritable bowel syndrome: bloating, abdominal pain eased by passing stool, and constipation or diarrhoea.

• Constipation, with stool and gas trapped in the bowel.

• Swallowing air from eating quickly, chewing gum, fizzy drinks and smoking.

• Dietary triggers: beans, onions, wheat, sweeteners such as sorbitol, and high-fibre foods introduced suddenly.

• Lactose or fructose intolerance, with symptoms soon after dairy or fruit.

• Small intestinal bacterial overgrowth (SIBO), and coeliac disease.

• Gastroparesis, functional dyspepsia and gallbladder problems.

• Ovarian cancer, ascites from liver or heart disease, and bowel obstruction, which are less common but important.

Bloating that is persistent and new, especially in women over 50, with early satiety, pelvic or abdominal pain, urinary urgency, unplanned weight loss, rectal bleeding, vomiting, a swollen abdomen with leg swelling or jaundice, or anaemia needs timely assessment.

• Call 999 or go to A&E: severe pain with vomiting and a swollen rigid abdomen, or being unable to pass wind or stool.

• Urgent GP: persistent bloating (most days for several weeks) in a woman over 50, or any age with weight loss or early fullness.

• GP within weeks: bloating with diarrhoea, blood in stool, weight loss or anaemia.

• Routine GP or pharmacist: intermittent bloating linked to diet or constipation.

The doctor asks about timing, triggers, bowel habits, weight loss, early fullness, pelvic pain, urinary symptoms, periods, medicines, family history of ovarian or bowel cancer and diet. They examine the abdomen for tenderness, fluid and masses and, in women, may perform a pelvic examination.

• Full blood count, ferritin and coeliac antibody test: for anaemia and coeliac disease.

• CA125 blood test with pelvic ultrasound: if ovarian cancer is a concern, per NICE guidance.

• Faecal calprotectin and FIT: to look for inflammatory bowel disease and bowel cancer.

• Breath tests: for lactose intolerance and SIBO in selected cases.

• Endoscopy or CT: for persistent unexplained symptoms.

Eat regular meals slowly, chew well, reduce fizzy drinks and chewing gum, and keep a food diary. Gradually increase soluble fibre such as oats, and consider peppermint oil if you have IBS. A dietitian-led low-FODMAP trial can help selected people but should not be continued indefinitely. Stay active.

On the NHS a GP assesses and refers to dietetics or gastroenterology. Private dietitians and gastroenterologists can be seen directly, with breath tests and coeliac screening arranged quickly.