The girl did not have menstruation for a month to deal with the following: 1, for this case, first of all need to draw blood to check blood HCG to rule out the possibility of pregnancy. 2, if excluded from the pregnancy, you need to further examination, gynecological ultrasound and sex hormone six. If sex hormone six is basically normal, gynecological ultrasound endothelial thickness is not less than 0.5cm, this situation can be considered progesterone treatment. If sex hormone six suggests menopausal level, gynecological ultrasound endothelial thickness is less than 0.5cm, then hormone replacement therapy can be considered.