I am having spots of heat at waist level of my left side, from front to back area. it feels like a hearing pad under my skin.comes and goes.

See your Doctor: Abdominal pain can have many complex causes. You need a physical exam to try and figure this out. Please see your doctor. If you are in severe pain go to an emergency center as soon as possible.

Explanation : For proper answer need to know more, like: when did it start, do you have a pain, how old are you, man or woman, your previous problems. Any other symptoms? If nothing else, possible it's nothing to worry about. Just observe yourself and relax. Be well.