Women’s left waist swelling mainly consider the following three reasons: 1, left lumbar muscle strain or lumbar fasciitis, which is the most common kind of disease, often occurs after exertion or cold, due to local ischemia, hypoxia and anaerobic metabolism, resulting in metabolic waste can not be effectively removed and aseptic inflammation, manifested in the left side of the lumbar soreness and swelling discomfort, the symptoms of the obvious people can cause significant pain, activities, and limitations. 2, urinary system diseases, especially the left side of the kidney stone caused by pyelonephrosis, the urinary ultrasound or CT examination can be clear. 2, urinary system diseases, especially the left side of the kidney stones caused by renal pelvic effusion, manifested in the left side of the waist, abdominal pain and discomfort, the line of urinary ultrasound or CT examination can be clear. 3, gynecological diseases, especially the left side of the tubalitis, due to the presence of inflammation caused by the left side of the waist and pain and discomfort, accompanied by an increase in vaginal secretion, the line of uterine adnexa ultrasound can basically be clear. Therefore, the specific causes need further examination to exclude other aspects of the disease, in order to clarify the diagnosis and symptomatic treatment.