The symptoms of back pain in a 20-year-old girl can be caused by a variety of possible reasons. Need to timely hospital medical treatment, let the doctor according to the patient’s specific nature of the pain, the corresponding examination and auxiliary examination for comprehensive judgment. If the girls for the symptoms of lumbar pain, and have long-term bad posture habits or cold and other factors triggered, it is likely to be a common lumbar muscle strain or lumbar disc herniation symptoms, through the correction of bad posture and symptomatic treatment can be relieved. If a girl has back pain as a symptom of colic, you need to exclude the possibility of urinary stones, ovarian torsion and other diseases, through the urological and gynecological ultrasound and other related examinations. If a girl has back pain with menopause, the possibility of ectopic pregnancy should be ruled out, and timely medical examination should be carried out to avoid serious complications such as hemorrhage. If a girl has back pain with fever, she should also consider the possibility of appendicitis or gynecological inflammation.