23.09.2025

What happens if you leave the microwave open after using it?

By Vitia

The microwave is one of the most commonly used appliances in the modern kitchen. It allows us to heat, defrost and cook food in a matter of minutes. However, there are small daily habits that can generate doubts about its correct use. One of them is: does something happen if we leave the microwave door open after using it?

Although it may seem a simple matter of comfort or habit, the truth is that this gesture can have implications for both health and safety in the home.

Below, we explore why leaving the microwave open is not the best practice.

What happens if you leave the microwave door open?

1. Accumulation of dust and dirt:

Leaving the door open allows dust, airborne particles and grease residue present in the kitchen to enter the interior of the appliance. This can affect the operation of the microwave and, in the long run, reduce its lifespan. In addition, when the interior is contaminated, the food you heat there can also be affected.

2. Risk of contact with children or pets:

An open door can be a temptation for little ones or curious pets. If they put their hand, metal objects or other items inside the microwave, it could cause domestic accidents or damage to the appliance if it is accidentally activated.

3. Persistent odors:

Many people think that leaving the door open helps ventilate the interior and prevent bad odors. However, it is best to clean the microwave after each use with a damp cloth or a natural solution of vinegar and water.

Leaving it open does not solve the root problem and instead contributes to the accumulation of bacteria.

Is it technically dangerous?

The microwave is designed to contain electromagnetic waves within its structure. These are only generated when the appliance is switched on and the door is closed. Therefore, if it is turned off, there is no radiation emission, even if the door is left open.

That is, it is not dangerous in terms of microwave exposure if you leave it open, but it can be unhygienic and potentially risky in a home environment with children or animals.

Practical tips

  • Clean the inside of the microwave regularly to prevent the proliferation of bacteria and bad odors.
  • Close the door after briefly ventilating it, if desired, but don’t leave it open for long periods.
  • Supervise children and pets to avoid accidents with open appliances.
  • Check the condition of the door seal and make sure it is working properly to avoid heat loss or malfunction.

Although there is no immediate health risk when leaving the microwave open after use, this habit can generate inconveniences related to hygiene, safety and maintenance of the appliance.

It is best to keep it clean and closed when not in use!