A 37-year-old woman presented with back pain, diffuse musculoskeletal pain, and muscle weakness without marked gastrointestinal symptoms. She complained of difficulty in walking and bilateral hip pain for the preceding year. Clinical examination revealed proximal muscle weakness especially in the lower extremities and a waddling gait pattern. Laboratory parameters and radiographic findings revealed the diagnosis of osteomalacia. The etiology of osteomalacia was investigated and a diagnosis of celiac disease was established. As osteomalacia symptoms may be the only presenting feature of celiac disease, it should be considered in the differential diagnosis of patients presenting with proximal muscle weakness and diffuse musculoskeletal pain.