The procedure is so gentle that most people have little to no discomfort. This is because the thyroid gland itself is not sensitive to pain. Other than the initial injection of numbing medication, the only remaining sensation is generally pressure. Intermittent sensations of discomfort thereafter can be treated with additional doses of pain medication or adjustment of the probe tip. Radio-frequency ablation does not cause any scarring to the external neck. In many cases, one puncture of the skin is sufficient to treat the entire thyroid gland.