It takes some time to feel the effect of drugs on painful menstrual cramps, but once a hot water bottle or hot towel is placed on the stomach area, the cramps reduces. Whats the relationship between heat and the pain?
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Applying a source of heat, like a hot water bottle to an area with cramps widens the blood vessels, stimulates blood flow and relaxes the muscles which reduces painful cramps (which are pretty much just painful involuntary muscle contractions).
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