No, electromagnetic waves cannot boil you from the inside without leaving any visible scars. Electromagnetic waves, such as radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays, interact with matter in various ways depending on their frequency and intensity.
While high-energy electromagnetic radiation like X-rays and gamma rays can cause damage to living tissues, including internal organs, it is not accurate to say that they can boil you from the inside without leaving any visible scars. The effects of such radiation exposure can indeed cause harm, including damage to cells, DNA, and tissue, which can lead to various health issues, including cancer and radiation sickness. However, these effects are not invisible and can be detected through medical examinations.
It's worth noting that exposure to high levels of electromagnetic radiation, such as those found in medical or industrial settings, can have serious health consequences. Therefore, it is important to follow safety guidelines, regulations, and use appropriate protective measures to minimize the risks associated with electromagnetic radiation exposure.