Perimenopause, or perimenopausal syndrome, may present with the symptom of having two periods a month. Perimenopausal syndrome is a series of symptoms caused by unstable levels of sex hormones before and after menopause. Changes in hormone levels can lead to changes in menstruation, which may increase or decrease in volume, and unstable menstrual cycles, which may be too long or shortened, resulting in two periods a month. Women with perimenopausal syndrome may also experience hot flashes, awakening in the early morning, poor concentration, anxiety, etc. Women in this period need to develop good living habits, regular diet, regular rest and relaxation, appropriate physical exercise, and seek medical attention if symptoms are severe.