A heating pad helps to soothe pain is clinically proven. Heating pad work on heat therapy and thermotherapy. In 2016, the Journal of Clinical and Diagnostic Research found that frequent use of heat therapy with hot water bottles soothes pain during cramps to those who take oral naproxen pain relievers.
Heat relaxes the muscles of the stressed uterus, as well as explain why a heating pad is so helpful for menstrual cramps. Heat improves blood circulation and helps in cramps during periods, neck pain, back pain, joints pain, relieves sore muscles, and reduces aches without meditation.
NOTE: If you are suffering from a major pain at that time you should consult the doctor. Basically, a heating pad is used for short term fix for acute pain.