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What causes PMS?
There is no one explanation for what brings on PMS, but it is to do with changes in the hormone levels during the menstrual cycle. According to NAPS, the function of the ovaries is the key to understanding the condition, particularly the rapidly changing levels of the hormones oestrogen and progesterone during the monthly cycle.
After menstruation, you should be symptom-free for at least a few days. If you experience symptoms during these few days, you are less likely to be suffering from PMS, and you should visit your GP for an opinion. However, some women find their symptoms return just after their period.