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.
PMS, a catch-all name for a myriad of physical and psychological symptoms, is thought to be caused by hormonal changes during the menstrual cycle. The exact cause, however, remains a mystery. Symptoms generally strike five-to-10 days before the period and dissipate with its start or soon after.