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Abdominal bloating

Definition

Abdominal bloating is a condition in which the belly (abdomen) feels full and tight. Your belly may look swollen (distended).

Causes

Common causes include:

• Swallowing air

• Constipation

• Gastroesophageal reflux disease (GERD)

• Irritable bowel syndrome

• Lactose intolerance and problems digesting other foods

• Overeating

• Small bowel bacterial overgrowth

• Weight gain

You may have bloating if you take the oral diabetes medicine acarbose. Some other medicines or foods containing lactulose or sorbitol, may cause bloating. Many foods high in fructose and related compounds cause gas.

More serious disorders that may cause bloating are:

• Ascites and abdominal tumors

• Celiac disease

• Dumping syndrome

• Ovarian cancer

• Problems with the pancreas not producing enough digestive enzymes (pancreatic insufficiency)

Home Care

You may take the following steps:

• Avoid chewing gum or carbonated drinks. Stay away from foods with high levels of fructose or sorbitol.

• Avoid foods that can produce gas, such as Brussels sprouts, turnips, cabbage, onions, garlic, beans, and lentils.

• Do not eat too quickly.

• Stop smoking.

Get treatment for constipation if you have it. However, insoluble fiber such as bran can cause more bloating and gas. Soluble fiber supplements such as psyllium are usually better tolerated.

You may try simethicone and other medicines that you can buy at the drugstore to help with gas. Charcoal caps can also help. Be aware that charcoal will turn your stool black. It is not harmful, but it is good to be aware of this effect.

Watch for foods that trigger your bloating so you can start to avoid those foods. These may include:

• Milk and other dairy products that contain lactose

• Certain carbohydrates, including fructose (fruit sugar), that are fermentable and thus can produce gas. These carbohydrates are known as FODMAPs.

When to Contact a Medical Professional

Contact your health care provider if you have:

• Abdominal pain

• Blood in the stools or dark, tarry looking stools

• Diarrhea

• Heartburn that is getting worse

• Vomiting

• Weight loss

References

Azpiroz F. Intestinal gas. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 17.

McQuaid KR. Approach to the patient with gastrointestinal disease. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 118.

Review Date: 6/11/2024

Reviewed By: Jenifer K. Lehrer, MD, Department of Gastroenterology, Aria - Jefferson Health Torresdale, Jefferson Digestive Diseases Network, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.