Proximal weakness specially in extremitas is a common neurologic symptom of patients, for which the physician should consider toxic, metabolic, infectious and paraneoblastic diseases affecting muscular system as well as primary myopathies. Osteomalacia is one of the most common considerations which is treatable but disabling as its natural course. Osteomalacia is the most often due to VITD or calcium deficiency but work up is necessary to find other primary defects that cause this disease. Renal tubular acidosis is one of these primary defects and osteomalacia secondary to it dose not respond to classic treatment of osteomalacia, so specific management is necessary. In this article we report six patients who have been referred to the clinic of neurology of Imam Khomeini Hospital since 1370 to 1374 with proximal weakness for whom RTA has been diagnosed
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