Pre-menstrual syndrome (Pi SMS or PMS) or premenstrual tension (PMT) is a collection of symptoms, physical, psychological and emotions associated with the menstrual cycle in women. and this is while more women in the age of "speciation" (Max up to 85 percent) physical signs related to the normal functioning of ovulation include bloating or softness, (breast tenderness) have experienced. Medical definitions of PMS to a pattern of persistent symptoms, physical and emotional (psychological) be finite, and that only during the luteal phase of the menstrual cycle, happens, that of "sufficient intensity to interfere with some aspects of life". In particular, signs of emotional (psychological) for the diagnosis of PMS, etc. must be present. Specific signs of mental and physical attributable to PMS, from, to, other, different. nonetheless, the pattern of symptoms for each woman, the individual, is predictable. These symptoms during the ten days before the menstruation, will happen, and shortly before or shortly after the start of the flow of the menstrual disappears.

only a small percentage of women (2 to 5%), and symptoms of pre-menstrual obvious that it can be of discomfort the ordinary associated with the menstrual cycle of healthy women apart. In terms of cultural, acronym PMS in English-speaking countries very well-known are the problems associated with the menstrual cycle, notes, and this stands without attention to the medical definition of it, is widely used in the conversations, dialog, and normal is used. In these cases, the symptoms rarely without the use of the abbreviation are stated, and refers to the meaning implied, it is more of a definition of its clinical attention.

"disorder, unwell pre-menstrual" (symptoms) the state is much more severe is that, as a psychiatric disorder similar to depression unipolar considered to be.