What could cause my stomach to be full of gas?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Excessive stomach gas is often caused by irritable bowel syndrome (IBS), food intolerances (like lactose or gluten), swallowed air, or gas-producing foods such as beans, dairy, carbonated drinks, and cruciferous vegetables. Underlying digestive conditions like SIBO, celiac disease, or gastritis can also contribute to persistent bloating.

Because gas and bloating can stem from many different causes, pinpointing the exact reason matters for finding effective relief. A free, instant, online symptom check can help you identify possible causes based on your specific symptoms and guide your next steps—whether that's a simple dietary change or a conversation with your doctor.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Feeling like your stomach is full of gas can be uncomfortable and happens for various reasons. One common cause is irritable bowel syndrome (IBS). IBS can make your tummy feel bloated and gassy. It is a condition that affects how your stomach and intestines work.

Here are some reasons why you might feel gassy:

Irritable Bowel Syndrome (IBS): IBS can cause bloating and gas. People with IBS often feel their stomach is full of air.
Certain Foods: Some foods can cause more gas, like beans, broccoli, and carbonated drinks.
Swallowing Air: Sometimes, when you eat or drink quickly, you might swallow extra air, which can make your stomach feel gassy.

To help with gas, you can try eating slowly, avoiding foods that make you gassy, and talking to a doctor if it keeps happening. If you're experiencing persistent stomach discomfort, you can check your symptoms to better understand what might be causing your gas and bloating.

(References)

Lacy BE, Cangemi D, & Vazquez-Roque M. (2021). Management of Chronic Abdominal Distension and Bloating. Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association, 32246999.
Hasler WL. (2007). Irritable bowel syndrome and bloating. Best practice & research. Clinical gastroenterology, 17643909.
Corsetti M, & Whorwell PJ. (2015). Managing irritable bowel syndrome in primary care. The Practitioner, 26455114.

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