Tumor-induced osteomalacia (TIO) is a rare paraneoplastic syndrome characterized by fibroblast growth factor-23 (FGF-23)-secreting mesenchymal tumors that cause renal phosphate wasting, hypophosphatemia, and osteomalacia, leading to debilitating musculoskeletal symptoms [1,2]. Here, FGF23 is linked to hypophosphatemia.