If women have symptoms of soreness on the left side of the waist, there may be several causes: first, lumbar muscle strain, if long-term use of one side of the waist for work or labor, can lead to chronic injury to the muscles of one side of the waist, resulting in symptoms of lumbar pain, then the relevant CT, MRI, X-ray examination of the waist, to exclude other diseases, diagnosis and treatment. Second, kidney disease, when there is a tumor in the kidney or a cyst in the kidney, one side of the waist can show symptoms of pain, often accompanied by urinary symptoms, such as hematuria and proteinuria, then urine tests and CT, MRI, ultrasound examination of the kidney should be performed for diagnosis and treatment.