The cause of an abdominal mass largely depends on its location. Cancer may be the cause of a mass located directly on an organ. Masses can also be benign or non-cancerous. A benign mass may be a fluid-filled cyst, a swollen gland, or a hernia. Swollen glands can often appear as masses in the prostate or spleen. Women may also experience uterine fibroids or ovarian cysts during pregnancy.
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