Polycythemia can result from internal problems with the production of red blood cells. This is termed primary polycythemia. If polycythemia is caused due to another underlying medical problem, it is referred to as secondary polycythemia.
PMS can last 1-2 weeks. Premenstrual syndrome (PMS) is characterized by a number of symptoms related to a womanâs menstrual cycle. They occur a week or two before monthly menstruation begins, and ordinarily, they disappear at that time.
How long does menopause last? Symptoms of perimenopause can last for up to ten years, but on average, they last for four years. Over time, the symptoms of perimenopause will lessen in severity, through menopause and the years following, called postmenopause.