What causes a hard lump under right rib cage?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A hard lump under the right rib cage may be caused by a growth on the bone, such as a bone tumor or cyst. These growths are often benign (non-cancerous), but in less common cases they can be more serious. Because it's difficult to tell the cause based on symptoms alone, a medical evaluation is essential to determine whether the lump is harmless or requires treatment.

Common possibilities include:

Benign bone tumors (e.g., osteochondroma)
Bone cysts
Cartilage-related growths
Rarely, malignant bone tumors

Since a hard lump under the ribs can range from harmless to serious, understanding your symptoms early can help you decide how urgently to seek care. A free, instant, online symptom check can help you clarify what might be causing your lump, identify possible conditions, and guide your next steps—whether that's monitoring at home or scheduling a visit with a doctor. Taking a few minutes now could save you time, worry, and unnecessary delays in getting the right care.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn what may cause a right-rib lump Discover if your lump needs urgent care Find out whether it could be serious See OTC options for related discomfort Find a doctor for right-side abdominal lumps Understand medically valid home remedies for lumps Check if your lump suggests a condition

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Explanation

A lump near the right rib cage may be caused by abnormal growth from the bone. Research has shown that some people can get growths like giant cell tumors, aneurysmal bone cysts, or even intraosseous lipomas in their rib bones. A giant cell tumor is where many cells grow in a lump on the bone, while an aneurysmal bone cyst forms a bubble-like swelling in the rib. An intraosseous lipoma is a rare growth made up of fat cells that happens inside the bone. Most of these are benign, which means they are not cancer, but they might still need treatment or careful watching because they can cause pain, weakness in the bone, or other problems. If someone notices a hard lump in this area, it is important to see a healthcare provider. You can start by using Ubie's free AI-powered symptom checker to better understand your symptoms before your appointment. They can perform tests like imaging studies to understand what the lump is and decide on the best care plan. Always follow professional advice for any health concern.

(References)

Yang E, Li T, Katz A. A giant cell tumor of the bone in the rib cage left to proliferate unfettered for seven years to an extensive size. Respir Med Case Rep. 2021 May 1;33:101419. doi: 10.1016/j.rmcr.2021.101419. PMID: 34401267; PMCID: PMC8348908.
Kamdem M, El Hammoumi M, Amraoui M, Bhairis M, Oukabli M, Kabiri EH. Aneurysmal bone cyst: a rare surgical tumor of the rib. Kardiochir Torakochirurgia Pol. 2021 Dec;18(4):268-271. doi: 10.5114/kitp.2021.112198. Epub 2022 Jan 9. PMID: 35079273; PMCID: PMC8768859.
Sivrikoz MC, Döner E, Durceylan E. Intraosseous lipoma of the rib. Turk Gogus Kalp Damar Cerrahisi Derg. 2019 Oct 23;27(4):590-592. doi: 10.5606/tgkdc.dergisi.2019.18040. PMID: 32082933; PMCID: PMC7018170.

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