(HealthDay News) — Primary dysmenorrhea is the most common kind of menstrual pain, the U.S. National Library of Medicine says.

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It is typically caused by an overabundance of chemicals produced by the uterus. These chemicals, called prostaglandins, trigger cramps when the uterus contracts and relaxes.

Pain associated with menstruation can start a day or two before your period and last for a few days or longer. The intensity of pain varies from woman to woman.

The agency suggests how to help ease menstrual pain:

  • Use a heating pad or hot water bottle on the lower abdomen.
  • Take a hot bath.
  • Practice relaxation techniques, such as yoga or meditation.

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