The nerves in your uterus cannot feel heat, cold, or electrical stimulation; endometrial ablation is usually performed using one of these technologies. You may have cramping or other discomfort after the procedure, but most women don’t feel pain associated with the procedure itself. Several weeks before the procedure, your doctor may give you medications that thin the lining of the uterus. The doctor may give you other medications the night before the endometrial ablation. These medications will make it easier to insert the devices used for the procedure into the uterus. There are several types of endometrial ablation, including electrosurgery, balloon ablation, bipolar radiofrequency ablation, and cryoablation.
You can find more information from the American Society for Reproductive Medicine on this topic here:
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