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Published on: 7/14/2026

What could be the causes of an abdominal lump during pregnancy?

An abdominal lump during pregnancy may result from benign growths such as desmoid tumors of the abdominal wall, cysts linked to maternal or fetal tissues, or other soft tissue masses. While many causes are non-cancerous, some require prompt evaluation to protect both maternal and fetal health. Any new or growing lump should be assessed by a healthcare provider without delay.

Because pregnancy changes how your body feels and looks, distinguishing a harmless lump from one that needs medical attention can be difficult on your own. Taking a free, instant, online symptom check can help you clarify possible causes based on your unique symptoms, understand urgency, and guide your next steps before your appointment—so you can advocate for yourself and your baby with confidence.

Reviewed for medical accuracy: 07/14/2026

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Explanation

There are a few possible reasons you might notice an abdominal lump during pregnancy. One possibility is an abdominal wall desmoid tumor, which is a noncancerous growth that can occur in the muscles or connective tissues, often influenced by the hormonal changes in pregnancy. In other cases, the lump could be due to cysts—these might arise from the maternal tissues or even be related to fetal abdominal tumors and cysts, although the latter are less common. Other benign soft tissue masses like lipomas (fatty tumors) might also appear during pregnancy as your body changes. The lump may be painless or cause discomfort, and if it changes size, becomes painful, or is associated with other symptoms like redness or tenderness, it is important to get evaluated. You can start by using a free AI symptom checker to better understand your symptoms before seeing a healthcare provider. A healthcare provider can arrange imaging studies, like an ultrasound, to determine the nature of the lump and decide whether any treatment or further monitoring is necessary. Getting a prompt evaluation helps ensure both your health and that of your baby.

(References)

  • Awwad J, Hammoud N, Farra C, Fares F, Abi Saad G, Ghazeeri G. Abdominal Wall Desmoid during Pregnancy: Diagnostic Challenges. Case Rep Obstet Gynecol. 2013;2013:350894. doi: 10.1155/2013/350894. Epub 2013 Jan 3. PMID: 23346436; PMCID: PMC3549390.

  • Cass DL. Fetal abdominal tumors and cysts. Transl Pediatr. 2021 May;10(5):1530-1541. doi: 10.21037/tp-20-440. PMID: 34189111; PMCID: PMC8192983.

  • Stemmer SM, Gomes C, Cardonick EH. A Case of Painful Growing Abdominal Wall Mass during Pregnancy Requiring Resection in the Second Trimester. Case Rep Obstet Gynecol. 2024 Jan 8;2024:5881260. doi: 10.1155/2024/5881260. PMID: 38229587; PMCID: PMC10789513.

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