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 Nyquil Last? As per the guidelines provided by its manufacturer Vicks, the effect of Nyquil last up to 8 hours. But beware, depending on how much you are sensitive to the sedating properties, this duration may get extended little longer. 6 hours, 8 hours, 10 hours, no matter how many hours you sleep, you would still feel heavy and drowsy for the next few hours.