The start time for symptoms associated with your period can vary with the individual, just like the actual amount of time your period lasts. Most people start getting cramps, becoming irritable, and experiencing breast tenderness during the week before the actual period starts.
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PMS is a nonsense term, it's one used to group together any negative symptoms leading up to menstruation - that may not even include menstrual symptoms, it suggests that 'PMS' is normal or inevitable, and by framing menstruation negatively it has a negative affect on how women perceive their periods. If you have symptoms than say the symptoms, not PMS.
In theory you could experience symptoms up to two weeks before menstruation, it depends on your menstrual cycle, your health, and what symptoms you mean by 'PMS'.
Not eveeryone experiences PMS before their period, but many do simply because PMS is such a vague term - there are over 150 symptoms described as being PMS, they're so vague that even a man could be diagnosed with PMS!
There is no scientific evidence to support the idea of PMS, it's considered a sociological condition in that how society makes you feel about menstruation can effect how you experience menstruation - e.g. you think of PMS as a negative, so you attribute negative symptoms to menstruation and also consider this to be normal, or you feel less happy about menstruation so will be moody during menstruation. It's a good idea to learn about PMS and change your attitude to menstruation, identify what really is associated with menstruation - anything negative like cramps is preventable.
PMS stands for pre-menstrual stress. The symptoms of PMS can start between 5 and 11 days before your period occurs.
Yes I'm 13 and started my period about 5 months ago so I was late I had pms for about a week before a started my period Xx