The causes of hidden pain on the left side of women’s lower back are the following: first, muscle tension, fasciitis, common in sedentary, bending work, cleaning, playing cell phones or student ambulation work, especially bending forward ambulation work, sitting for a long time after coupled with strain, cold easily caused, this condition is generally hot compresses, bed rest or anti-inflammatory and analgesic, blood circulation drugs, but also rehabilitation training, physical therapy, can be significantly relieved. All can be significantly relieved. Second, young women need to pay attention to exclude dysmenorrhea and gynecological inflammation, older women need to exclude osteophytes and osteoporosis if menopause. Third, if there is a herniated disc and arthritis, it is also easy to cause pain. Fourth, the rare cases including abdominal pain, nausea, urinary urgency and painful urination need to exclude gastrointestinal diseases or urinary stones, infections and other internal diseases or urological diseases caused by the regular hospital need to go to the regular hospital for clear examination and symptomatic treatment.