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Dysmenorrhoea is what you are going through.A hormonal
imbalance , cysts can be a cause of this.It happens that the menstrual cramps
are not tolerated by all women , some tolerate them better.
I advise to visit your Gynecologist and get evaluated completely for any underlying disease.Over the counter medicines like Meftal spas
work by relaxing the uterus
and decreasing the pain.They can help your symptoms.