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Published on: 8/18/2026

What are the potential health implications of swelling under the ribs on the left side in females?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

Swelling under the left ribs in females is most commonly caused by splenomegaly (an enlarged spleen), parosteal lipoma (a benign fatty growth on the bone), or rib exostosis (a bony outgrowth). Each condition presents differently: splenomegaly often causes fullness or tenderness, lipomas feel soft and movable, and exostoses feel firm and fixed. Because these causes range from benign to serious, and can overlap with issues involving the stomach, pancreas, or colon, a proper medical evaluation is essential to identify the source and determine treatment.

Left-sided rib swelling can stem from many possible causes, and self-diagnosis is rarely accurate. Before booking an appointment or heading to urgent care, it's smart to gather clearer information about your symptoms. Take a free, instant, AI-powered symptom check to better understand what may be causing your swelling and confidently plan your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Swelling under the ribs on the left side can be caused by different medical conditions. One potential cause is rib osteomyelitis, which is an infection of the bone and can present as an abdominal mass, leading to discomfort or pain.

Another possible cause is a parosteal lipoma, which is a benign tumor made of fat tissue that can grow on the rib. This can cause the space between the ribs to widen and may lead to noticeable swelling.

Additionally, rib exostosis, which is an abnormal bone growth on the rib, can also lead to noticeable swelling. This condition is rare but can result in a large, bony mass that might be uncomfortable.

If you're experiencing swelling in this area, consider using a free symptom checker to help identify potential causes before seeking medical advice for a proper diagnosis and treatment plan.

(References)

  • Raffaeli G, Borzani I, Pinzani R, Giannitto C, Principi N, & Esposito S. (2016). Abdominal mass hiding rib osteomyelitis. Italian journal of pediatrics, 27068333.

  • Tamang M, Mahalik SK, & Tripathy TP. (2023). Parosteal lipoma of rib causing widening of intercostal .... BMJ case reports, 37899078.

  • Jilowa S, Paliwal P, Kapur A, & Verma GC. (2021). Exostosis of Rib: Case Report of an Extremely Rare Giant .... The Indian journal of radiology & imaging, 34790327.

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