Hi there-You ask a good question...The fact is that electromagnetic radiation exists along a spectrum, and terms like "microwave", "infrared', etc, are just descriptors of where along the spectrum the energy being discussed lies. The truth is that sunlight and the radio waves that transmit your cell phone signal and music to your car stereo are also forms of electromagnetic radiation- but there is little reason for concern that these may cause cancer because they do not penetrate our bodies enough to damage our DNA.Similarly, the microwave energy used in miraDry treatments is safe because it is very tightly focused at the depth of the apocrine sweat glands in the axillae- penetrating deeply enough to coagulate them, but not deep enough or for long enough to cause injury to the skin, nerves, blood vessels, etc.There is now data on a very large number of patients over multiple years showing the treatment to be not only safe and effective, but associated with an unprecedented level of patient satisfaction.