Hidden pain in the left side of the woman’s left fork may be due to lumbar myofasciitis, lumbar muscle strain, gynecological, urological diseases and other causes. 1. Lumbar Fasciitis: Prolonged poor posture, prolonged standing and sitting, exposure to cold or long-term chronic injury may lead to the emergence of localized lumbar fasciitis. Fasciitis will lead to slow down the blood circulation of the local fascia, local muscle hypoxia, ischemia, muscle spasm or ankylosis, acidic metabolite accumulation, stimulation of the peripheral nerve roots, pain symptoms. 2. Lumbar muscle strain: women sit for a long time without activity, will gradually lead to lumbar muscle strain. Lumbar muscle strain will appear on the left side of the waist at the hidden pain clinical symptoms. 3. Gynecology: common gynecological diseases such as left salpingitis, pelvic inflammatory disease, endometritis and other gynecological diseases will have radiating pain or inflammation spread, which may lead to pain in the left side of the waist. 4. Urinary system: the kidneys belong to the retroperitoneal organs, located in the body of the twelfth lower edge of the ribs and the lateral edge of the erector spinae muscle in the renal angle, when the kidney lesions, may also appear in the left side of the pain in the waist, such as the left side of the ureteral stones, the left side of the glomerulonephritis and so on. There may also be other reasons for women’s left-sided pain, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.