Causes of sudden lumbar pain in women: I. Lumbar muscle strain. Long time engaged in standing work, due to continuous standing, the lumbar tendon ligament stretching ability is weakened, the local accumulation of excessive lactic acid inhibits the normal metabolism of the lumbar muscle and lead to lumbago. Second, the infection of the urinary system. Acute and chronic nephritis can easily cause lumbago. Third, cold, trauma or suffering from rheumatism, rheumatoid, arthritis people. Four, suffering from chronic pelvic inflammatory disease, uterine fibroids may also lead to lumbago.