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Hard Lump Under Sternum: Causes, Diagnosis, and 2026 Clinical Guidelines

"Discovering a hard lump under your sternum (breastbone) can cause immediate concern, but the vast majority of these findings represent normal skeletal anatomy or benign tissue changes rather than dangerous malignancies. In most instances, an unfamiliar firm projection at the lower midline of the chest is simply the xiphoid process, an anatomical structure that many individuals only notice later in life or after changes in body composition. However, any newly discovered mass, rapid localized growth, or persistent pain warrants a structured clinical evaluation. Medical standards emphasize early differentiation between physiological bony landmar..."

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