Sudden back pain in women may be caused by acute lumbar sprain, lumbar spondylolisthesis, pelvic inflammatory disease and other reasons. 1. Acute lumbar sprain: when women suddenly have lumbar soreness, it may be an inadvertent flash of the waist, or a muscle strain caused by lifting a heavy object, which usually results in the symptom of lumbar soreness. 2. Lumbar vertebral osteophytes: when patients have lumbar vertebral osteophytes, the hyperplasia of the bone will produce localized inflammation and stimulate the surrounding nerve endings. This leads to sudden back pain in women. 3. Pelvic inflammatory disease: when a woman suffers from pelvic inflammatory disease, if the inflammation spreads to the lumbar muscles and lumbar tissues, it may lead to sudden lumbar pain, lumbar soreness and other symptoms in female patients. When female patients suffer from sudden back pain, they should go to the hospital in time for examination and relevant treatments under the guidance of the doctor.