The left lower abdomen as well as left lower back distension is mostly due to pelvic inflammatory disease, but may also be caused by chronic cervicitis or cervical lesions, or even cervical cancer. Abnormal symptoms may also occur if there are uterine fibroids, pelvic endometriosis, chocolate cysts or adnexal masses. Symptoms may also occur if there is mycoplasma, chlamydia or vaginitis. If the symptoms persist for a long time, it is best to come to the hospital as soon as possible. It is recommended to do routine white belt, mycoplasma culture and cervical cancer prevention examination, and ultrasound if necessary, for a clear diagnosis and treatment under the guidance of a doctor. If there are fibroids or even huge pelvic masses, surgery may be required; if pelvic inflammatory disease is diagnosed, antibiotic treatment or combined herbal treatment may be required; if mycoplasma infection or various types of vaginitis are found, they may need to be treated with medication under the guidance of a doctor.