Lower back pain can not straight up belongs to the performance of activity limitation, activity limitation may be caused by the lumbar itself disease, other systemic diseases. 1. lumbar itself disease: life in the waist suddenly pain straight up, may be caused by acute lumbar sprain, acute lumbar sprain will lead to local myofascial edema, pain, serious patients may appear activity limitation performance. In addition to the acute stage of lumbar disc herniation, lumbar pain is severe, edema and compression symptoms are more serious, may also lead to erectile difficulties, limited activity performance. 2. Other systemic diseases: when the retroperitoneal organs and female gynecological diseases affect the lumbar muscles, the inability to stand upright may also occur, such as urinary stones, acute pancreatitis and other retroperitoneal organ lesions, may cause radiating pain in the lumbar and back, the symptoms mentioned above; female patients with a combination of gynecological underlying diseases, may also appear in the difficulty to stand upright, such as pelvic inflammatory disease, adnexitis, and so on. There may also be other reasons for the back pain, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.