Is it dangerous to leave the microwave open after using it?

1. No immediate radiation hazard

People often worry about microwave radiation, but microwave ovens are built to fully contain electromagnetic waves once cooking stops.

When the door is open and the microwave is off, there is no active emission of microwaves.

👉 Bottom line: There is no radiation risk if the microwave is switched off, even with the door open.

2. Faster dirt and bacteria buildup

Leaving the door open exposes the microwave interior to dust, grease, insects, and airborne bacteria. This can contaminate the inside and, in turn, the food you reheat later.

In humid areas or kitchens with lots of cooking vapors, this exposure can even encourage mold growth.

👉 Tip: Air it out briefly, then close the door to avoid contamination.

3. Possible damage to the appliance

Microwave door hinges are designed for repeated opening and closing, not to stay open for long stretches.

Keeping the door open constantly can strain the hinges and locking mechanism, which might lead to malfunctions or even safety issues over time.

👉 Recommendation: Always shut the door when you’re finished using the microwave.

4. Reduced energy efficiency

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