Transient osteoporosis of the hip, idiopathic, is a table, beginning with hip pain without a history of trauma, usually self-limiting and seen in middle-aged men and pregnant women. In this case report, a male patient who was admitted because of hip pain and detected transient osteoporosis go the hip was discussed. The purpose of the case presentation is to emphasize the necessity of transient osteoporosis of the hip in the differential diagnosis of sudden onset of hip pain and to review the literature on this subject.