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Cramps during periods are common .They are not bearable for some , whereas others can.It is based on your capacity of bearing pain.If they are very severe , it could be dysmenorrhoea , which needs evaluation.
I advise you to visit your Gynecologist and get examined if there is any underlying disease.
Meanwhile you can take an antispasmodic over the counter like Meftal
Plus to reduce the cramps.