Can steam damage a microwave?

Online Answer
Microwaving anything with a tight skin or shell (like eggs, hot dogs, squash, etc.) is a risky business. As the moisture inside these foods is heated by the microwaves, steam will start to build.
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No, using a microwave oven to heat food is not harmful. When used according to manufacturers' instructions, microwave ovens are safe and convenient for heating and cooking a variety of foods. The food heated in a microwave does not become radioactive and is therefore safe.