We have reported one case, aged 17 years, who repeated psychiatric symptoms concurrent with the menstrual cycle. She rapidly deceloped psychiatric symptoms immediately before menstruation and repeated the phasic cycle subsequent to a very short remission period in the intermenstrual phase. The psychiatric symptom immediately before menstruztion was a menic state with a nuance of schizophrenia, and after the intermenstrual phase was an apathetic state. Estrogen excretions in the urine were of low values in the pathological phase, particularly in the mood-elevated phase. EEG showed the so-called ”see-saw” phenomenon with normal findings in the pathological phase and appearance of slow waves in the remission phase. After several pathological cycles repeated, the patient entered a complete remission state withiout leaving any traces of psychiatric symptoms, and has since had no recurrence.