What are the common causes of an enlarged upper abdomen?

Reviewed by Yoshinori Abe, MD

Internal Medicine

An enlarged upper abdomen is often caused by swollen lymph nodes in the belly, a condition known as mesenteric or abdominal lymphadenopathy. This swelling typically develops in response to infections (viral, bacterial, or parasitic), inflammatory conditions, autoimmune disorders, or, less commonly, certain cancers such as lymphoma. Symptoms may include abdominal fullness, tenderness, bloating, fever, or unexplained weight loss.

Because the underlying causes range from mild, self-limiting infections to more serious health issues, identifying the source of the swelling early is essential for effective treatment and peace of mind. Rather than guessing or waiting, take a free, instant, AI-powered symptom check to better understand what may be driving your symptoms and get clear guidance on the right next steps to take.

Reviewed for medical accuracy: 07/15/2026

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Explanation

An enlarged upper abdomen can be a result of swollen lymph nodes in the belly area. These swollen nodes, also known as lymphadenopathy, can be caused by various conditions. Mesenteric lymph nodes in the abdomen may become noticeable due to infections or inflammatory diseases.

Here are some common causes:

Infections: Sometimes, infections can cause the lymph nodes to swell up. This can be due to viruses, bacteria, or other germs.
Inflammatory conditions: Certain diseases that cause inflammation in the body, like Crohn's disease, can lead to swollen lymph nodes.
Liver-related issues: Swelling around the liver, known as periportal lymphadenopathy, can also lead to an enlarged abdomen.

If you notice any unusual swelling in your abdomen, you can use our free AI symptom checker to help identify potential causes and determine whether you should consult a healthcare professional for a proper diagnosis and treatment plan.

(References)

Lucey BC, Stuhlfaut JW, & Soto JA. (2005). Mesenteric lymph nodes seen at imaging: causes and .... Radiographics : a review publication of the Radiological Society of North America, Inc, 15798054.
Krishna NB, Gardner L, Collins BT, & Agarwal B. (2006). Periportal lymphadenopathy in patients without identifiable .... Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association, 17059897.
Maeda T, Hori Y, Yamaguchi N, Mori H, Hata H, Yamada Y, et al. (1995). Clinical significance of lymphadenopathy in the upper .... Nihon Igaku Hoshasen Gakkai zasshi. Nippon acta radiologica, 7746723.

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