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You are experiencing DYSMENORRHOEA, which is a common condition. Sometimes its due to a pathology of the reproductive system like uterine fibroid
etc . And mostly the cause is unknown. But it usually and gradually reduced with pain, or perhaps the threshold of pain
in increased over the years.
Pain medications can be helpful here. There are some homeopathic remedies which you can take safely for this.
Also, to be on the safer side , you can undergo an ultrasonography
of the abdomen, to make sure everything is okey there.