It's not just an old wives tale...
Hot water bottles really do help ease period pains.
Scientists have found that heat, such as holding a hot water bottle, on where the period pain is felt doesn't just provide comfort.
Period pain is caused by contractions in the uterus. The blood vessels in the muscle wall are compressed by the contractions, which cut off blood supply to the womb, starving it of oxygen and causing discomfort. Heat from a hot water bottle switches on heat receptors at the site of pain. These switched on heat receptors in turn block chemical messengers that cause pain to be detected by the body, much the same as painkillers work. Therefore, by placing a hot water bottle on the lower tummy area helps to ease period pains.