Women ovulation is in the ovulation period, a few sensitive women will have back pain symptoms, while most of them do not have corresponding symptoms during ovulation, while two reasons need to be considered: 1, physiological: a few sensitive women have a transient back pain symptom induced by follicle rupture during ovulation, resulting in tissue fluid stimulation of surrounding tissues and local inflammatory reaction; 2, pathological: some women have more intense back pain and back pain symptoms during ovulation, and may have chronic pelvic inflammatory disease, adnexitis, tubal blockage.