What medical conditions can cause my upper abdomen to swell?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Swelling in the upper abdomen is a common symptom that can result from several underlying conditions, most often bloating caused by gas, indigestion, or fluid buildup. Other potential causes include gastritis, constipation, food intolerances, liver conditions, or, in some cases, more serious issues like an enlarged organ or abdominal mass.

Because upper abdominal swelling can point to a wide range of possible causes—some minor, others requiring medical attention—it's important not to guess. Understanding what's actually driving your symptoms is the first step toward relief and peace of mind. Take a free, instant, online symptom check to get personalized insights and clear guidance on what to do next.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Swelling in the upper abdomen can happen for several reasons.

1. Bloating:

Bloating is when your belly feels full and tight. It can make your abdomen look bigger. This can happen because of gas or other issues inside your abdomen. This has many different causes including but not limited to IBS, food intolerance, digestive issues.

2. Thyroid Problems:

Your thyroid is a gland in your neck that controls many things in your body, including how you digest food. When you have an underactive thyroid is can cause constipation and digestive issues which can lead to bloating.

3. Gallstones:

Gallstones are small stones that form in a part of your body called the gallbladder. Some patients with gallstones may experience bloating after eating.

If you have any concerns about your health, you can use our free AI symptom checker to better understand what might be causing your symptoms and when to seek medical care.

(References)

Chang L, Lee OY, Naliboff B, Schmulson M, & Mayer EA. (2001). Sensation of bloating and visible abdominal distension in .... The American journal of gastroenterology, 11774947.
Ebert EC. (2010). The thyroid and the gut. Journal of clinical gastroenterology, 20351569.
Diehl AK. (1992). Symptoms of gallstone disease. Bailliere's clinical gastroenterology, 1486206.

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