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.
Hormones are one of the most studied aspects of PMS's origins. PMS occurs near the end of a woman's menstrual cycle, within seven to 14 days before menstruation. During this cycle, which takes about 28 days, an egg matures and is released from the ovaries for possible fertilization.