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These kinds of extreme symptoms started a week before her period when she was in what's known as the luteal phase of her menstrual cycle and for years she had believed it was completely normal.

It could explain why women playing contact sports appear injury prone in their luteal phase, between ovulation and menstruation, University College London researchers say.

The researchers studied the changes that took place when the participants underwent two phases of the menstrual cycle: the follicular phase and the luteal phase.

In the early part of the luteal phase, which comes after ovulation but before your period starts, estrogen remains high and progesterone joins it.

This luteal phase of the cycle starts with the release of the egg at ovulation and ends when a period begins.