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Microwave radiation is the same kind of "radiation" as visible light and radio waves,the ionizing radiation that can cause cancer or radioactivity. The only known risk of a leaking microwave is the high levels of heat it produces. This is most dangerous to the eye (where it can lead to cataracts) and the testes (where it can cause temporary sterility).Extreme levels of microwave radiation can cause skin burns. If you do not notice any symptoms and you stop using the leaking microwave, lasting damage is very unlikely.