Premenstrual syndrome is a category of signs that occur in women of reproductive age prior to their menstrual cycle. The precise symptoms of PMS differ considerably from one person to another. These signs usually appear a week or two before menstrual bleeding begins, then they go back until the bleeding ends.
Physical and emotional disruptions can vary in intensity and length from one episode to the next, as well as from one individual to the next. Many women, on the other hand, notice general variations of symptoms over time and know what to expect. They also learn to forecast the onset of PMS over time. Symptoms of pre-existing medical problems can often become worsened in certain people at this time. PMS symptoms can be so extreme that they are nearly incapacitating in some cases. The premenstrual dysphoric disorder is the medical term for this disease (PMDD).