What was actually tested
A 2001 randomised trial enrolled 84 people with menstrual pain. An abdominal heat patch used over two days provided more reported relief than an unheated patch with placebo tablets.
The result supports that particular form of surface heat. It does not show that every heat device has the same effect, or that NUSBE treats the underlying cause of painful periods.
A practical home option
The NHS suggests a warm bath or a heat pad or hot-water bottle wrapped in a towel. Follow the product’s instructions, keep the warmth comfortable and check your skin. Do not sleep with a heat pack or apply it over numb or damaged skin. Ask a clinician first if you have circulation problems.
Know when to seek care
Pain that becomes more severe, disrupts normal activities or comes with bleeding between periods needs assessment. If pelvic pain occurs when pregnancy is possible, seek prompt medical advice rather than assuming it is an ordinary cramp.