Chronic Bloating

What is Chronic Bloating?

Chronic bloating is a persistent sensation of abdominal fullness, pressure or trapped gas. It is called distension when the abdomen visibly gets bigger, and the two often occur together but can occur separately.^[1] Bloating is one of the most commonly reported digestive symptoms and can come from organic or functional disorders.^[2]

Common symptoms

Bloating itself is the main symptom. It often comes with other digestive complaints.^{[1, 2]}

• A tight, full or swollen abdomen, often worse after meals or later in the day
• Gas, belching and abdominal discomfort
• Changes in bowel habits such as constipation, diarrhea or both
• Early fullness when eating

Causes and risk factors

Chronic bloating has many possible causes. These include food intolerances, a previous infection that disturbed the gut bacteria, increased sensitivity of the gut, slow intestinal transit and other disorders of gut-brain interaction.^[1] Functional bloating often occurs together with functional dyspepsia, irritable bowel syndrome (IBS) and functional constipation.^{[1, 3]}

Other conditions can also cause it, such as celiac disease, small intestinal bacterial overgrowth, slow stomach emptying, pancreatic problems, liver disease with fluid in the abdomen, and ovarian disease. Bloating is common before or during menstrual periods as well.

How it is diagnosed and treated conventionally

Functional bloating is diagnosed using the Rome IV criteria after organic disease has been excluded through history, physical examination and a check for alarm signs. In the absence of alarm signs or other findings, blood tests, imaging or endoscopy are generally not needed.^[2]

Treatment depends on the cause. Options include dietary changes such as limiting lactose or following a low FODMAP diet, probiotics, antispasmodics including peppermint oil, antibiotics such as rifaximin, secretagogues, neuromodulators and biofeedback.^{[1, 2]} No regimen has worked consistently for everyone, so setting expectations and treating any underlying disorder matter.^[1]

Why Chronic Bloating calls for a whole-person approach

Chronic bloating rarely has a single cause. Gut sensitivity, movement of the intestine, bacteria, food and the nervous system all play a part, so symptoms can persist even after a medical workup is reassuring.

Care that looks at several of these factors at once is a reasonable addition to a medical evaluation. It does not replace finding the cause.

Gut sensitivity and the gut-brain connection

The cause of functional bloating is multifactorial and involves visceral hypersensitivity, abnormal coordination between the diaphragm and abdominal wall, slowed intestinal movement and changes in gut bacteria.^[2] IBS is classed as a disorder of gut-brain interaction with a role for psychosocial factors.^[3]

Diet and food intolerance

Food intolerances and fermentation of poorly absorbed carbohydrates can contribute to bloating, which is why dietary changes are a standard first step.^{[1, 2]}

Gut movement and transit

Delayed intestinal transit and constipation can contribute to bloating.^[1] Treating constipation is part of conventional care when it is present.^[4]

Stress and mood

Anxiety and depression are common alongside functional gut disorders, and the initial IBS plan includes managing associated psychological disorders.^[4] Cognitive behavior therapy and hypnotherapy can be used for functional bloating associated with IBS.^[2]

Acupuncture for Chronic Bloating

What the research shows

No sham-controlled trials of acupuncture for chronic bloating alone were found, so the evidence for bloating itself is limited. The best-designed related trial is in postprandial distress syndrome, the meal-related form of functional dyspepsia, where upper abdominal bloating is one of three main symptoms. In 278 adults in China, 12 sessions of acupuncture over 4 weeks gave a higher response rate than sham acupuncture, 83.0% versus 51.6%. The effect lasted through 12 weeks of follow-up. Only about 28% of acupuncture patients and 17% of sham patients lost all three main symptoms, and the authors noted a high dropout rate and the inability to blind the acupuncturists.^[5]

Earlier reviews are less clear. A Cochrane review of seven trials of acupuncture for functional dyspepsia (542 people) rated all the evidence low or very low quality and could not say whether acupuncture works better or is safer than other treatments.^[6] A 2024 Bayesian meta-analysis found acupuncture combined with Western medicine improved dyspepsia symptoms more than Western medicine alone.^[7]

For IBS, which often includes bloating, a meta-analysis of 17 trials found no benefit of acupuncture over credible sham acupuncture on symptom severity or quality of life, though patients in non-placebo trials reported more benefit than with some medicines.^[8] An umbrella review of 15 systematic reviews of acupuncture and moxibustion for IBS found most suggested benefit, but rated the methods as low or very low quality.^[9]

How acupuncture may work

Researchers propose that acupuncture may influence gut movement, gut sensitivity and the body's stress response, although the mechanisms are not settled. In the dyspepsia network meta-analysis, a warming-needle technique ranked best for raising levels of motilin, a hormone involved in gut movement.^[7] These are proposed explanations drawn partly from trials with limited quality.

What treatment involves

Treatment uses fine, sterile, single-use needles placed at points on the abdomen, arms, legs and sometimes the back, usually left in place for about 20 to 40 minutes. We reassess after a short course of visits. The dyspepsia trial gave 12 sessions over 4 weeks.^[5]

In prospective studies, about 9 in 100 patients had a minor reaction such as bleeding, soreness or redness at a needle site, and serious events occurred in about 1 in 10,000 patients.^[10] Tell the practitioner first if you have a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker (relevant to electroacupuncture).

Ayurvedic medicine for Chronic Bloating

The Ayurvedic view

In Ayurveda, bloating is generally linked to weak or irregular digestive fire (agni) and the build-up of undigested material (ama), with Vata, the principle of movement, often described as aggravated. Related traditional conditions include Adhmana (distension) and Amlapitta (sour indigestion). These are traditional explanatory frameworks, not biomedical diagnoses.

Therapies that may be used

Care is chosen for the individual and traditionally combines:

• Diet and routine intended to support digestion, such as warm, freshly cooked meals, regular mealtimes, eating without rushing and a gap between dinner and sleep
• Culinary and digestive spices such as ginger, cumin, fennel and ajwain, used in food or as individually prescribed herbal preparations
• Triphala and other herbs that are traditionally used for digestion and bowel regularity
• Gentle abdominal oil massage and stress-reducing practices such as breathing exercises

Dietary changes are also part of conventional care for functional bloating, so this guidance can complement the plan from your physician or dietitian.^[2]

Panchakarma is not appropriate during pregnancy, acute illness or frailty, or before bloating has been medically evaluated. It should not be used where an organic disease such as bowel obstruction has not been excluded.

What the research shows

The research is very limited. No controlled trials of Ayurvedic treatment for bloating or IBS were found in PubMed. One single-group study of 30 people with Ayurvedic-defined upward-moving Amlapitta, treated for dyspepsia-type symptoms with individualized preparations for 28 days, reported symptom improvement. It had no comparison group, so it cannot show that the treatment caused the change.^[11]

Herbal medicine for Chronic Bloating

Herbs and formulas that have been studied

Herbs have mostly been studied for the conditions that cause bloating, not bloating alone. These include peppermint oil, caraway oil, turmeric and a combination preparation known as STW5 for dyspepsia, and Chinese herbal formulas for dyspepsia and constipation-predominant IBS.^{[12, 13, 14, 15]} Chinese formulas are individualized, and the herbs most often used in trials of liver-stomach disharmony type dyspepsia included Baishao, Chaihu and Gancao.^[14]

What the research shows

The evidence is limited, and mostly of low or very low certainty. A Cochrane review of 41 trials of non-Chinese herbal medicines for functional dyspepsia found that peppermint and caraway oil probably improve global symptoms compared with placebo, and that turmeric (Curcuma longa) probably gives a moderate improvement, both at 4 weeks and on moderate-certainty evidence. STW5 may help, but the evidence was very uncertain.^[12]

For IBS, a meta-analysis of 10 trials found peppermint oil better than placebo for global symptoms and abdominal pain, but adverse events were more frequent and the quality of evidence was very low.^[13] A systematic review of turmeric in digestive disorders found possible benefit in IBS and inconsistent effects elsewhere, with most studies at high risk of bias.^[16]

Chinese herbal studies are mostly of poor quality. A meta-analysis of 13 trials (1,153 patients) of dyspepsia of liver-stomach disharmony found better response with Chinese medicine than with prokinetic drugs, with poor methodological quality.^[14] A meta-analysis of 11 trials of IBS with constipation found better results than with cisapride and mosapride, with a small sample and low quality.^[15]

Safety and herb-drug interactions

Herbs are active substances and can interact with medicines. Case reports describe bleeding when warfarin was combined with herbs including dang gui (Angelica sinensis), dan shen (Salvia miltiorrhiza), ginger, ginseng and Boswellia.^[17] People taking blood thinners need a practitioner's review before using herbs.

In one study, about one fifth of Ayurvedic medicines bought online contained detectable lead, mercury or arsenic.^[18] Herbs should come from tested sources and be prescribed individually. Peppermint oil caused more adverse events than placebo in trials,^[13] and a review of non-Chinese herbal medicines found red pepper caused more adverse events than placebo.^[12] Tell us if you are pregnant or breastfeeding, have liver or kidney disease, take prescribed medicines, or have surgery planned.

Translating traditional medicine into modern biological language

The links drawn here are interpretation, not equivalence. Chinese medicine often describes bloating as stagnation of qi, or as spleen deficiency with dampness. Researchers studying digestive symptoms measure things that loosely parallel this picture: gut movement, visceral sensitivity and the gut-brain connection.^{[2, 3]}

Ayurveda's weak agni and ama describe poor digestion and the build-up of undigested food. Modern research looks at carbohydrate fermentation, gut bacteria and slowed transit.^[1] No study has shown that these traditional concepts correspond to a specific biological process.

How this care fits with your medical care

Integrative care for chronic bloating is complementary. Chronic bloating needs a medical evaluation to look for a cause, and we do not diagnose it. Keep your physician or gastroenterologist, and do not stop or change prescribed medicines without your prescriber.

Please bring your diagnosis if you have one, test results such as celiac, breath or imaging tests, a full list of medicines and supplements, and notes on what foods or events seem to trigger symptoms.

When to seek urgent medical care

Bloating with alarm symptoms needs prompt medical assessment, because it can be a sign of a serious disease.^{[2, 4]}

• Unintentional weight loss
• Blood in the stool, or black stools
• Persistent vomiting, or severe or worsening abdominal pain
• Rapid swelling of the abdomen, especially with yellowing of the skin or swollen legs
• Difficulty swallowing, or new symptoms after age 50
• Bloating with a new change in bowel habit that does not settle, or a family history of colon cancer or celiac disease

If you have severe abdominal pain, repeated vomiting, a rigid or very swollen abdomen, or you cannot pass stool or gas, call 911 or go to the nearest emergency department.