What does it mean when my menstrual symptoms change at 50?

Perimenopause. Perimenopause is a time when hormone production is not consistent and is a time that menstrual cycles can become irregular and vary in amount of bleeding. Menopausal symptoms like hot flashes, night sweats, etc may also come and go sporadically. Perimenopause can begin up to five years or more before actual menopause occurs.