Mold on Mattresses

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Written by: Alex Savy
Last updated on

Molds are very common things on mattresses nowadays, and it might not even have anything to do with the way you clean your mattress. Molds are created due to many environmental conditions, and anyone might have them on their mattress. That is why we have decided to address this issue and suggest possible ways to remove the mold on mattress

Key Takeaways

  • You're more likely to see mold on your if your room doesn't have enough light or if it has humidity. Another reason for mold would be a lack of ventilation, meaning your mattress is unable to breathe. 
  • If your mattress shows signs of mold, you can use alcohol and hydrogen peroxide to remove it. If the mold is too extensive, you may need a professional cleaner.

Reasons Why you Might have Mold on Mattress

Before we know how to get rid of the molds, we need to find the source of the problem and talk about why a mattress can develop molds on it. The best way to fight molds on a mattress is to prevent them from growing on the mattress in the first place.

Dark Environment

It is a well-known fact that a dark environment helps molds grow faster. The best place for this is beneath a mattress. Molds can grow much easier underneath a mattress that doesn’t have any ventilation or movement, or one that is away from the sunlight or lights. Sunlight is one of the best antibacterials [1]. However, if you can’t provide that for the room where your mattress is, you can just use ventilation and other lights to keep the area from being closed and damp. 


Another thing that helps molds grow is moisture. Molds love wet places, and they feed on them, so if the mattress absorbs too much of your body moisture or sweat, it is going to become the perfect place for molds to grow. Another kind of moisture is a wet mattress. That is why you should dry your mattress regularly. 

I have a humid room, so I invested in a dehumidifier. Too much humidity doesn't just give rise to mold. It can also provide resources for other pathogens or pests to breed. Thus, whenever my mattress gets damp, I dry it out immediately to avoid mold growth.

Make sure you don't leave any stains from drinks or food on your mattress, either. Stains don't always mean that the liquid has evaporated but rather that they have been absorbed into the inner layers. That is why you should always properly clean and dry stains.

Mattress being on the Floor

Many people might use their mattresses on the floor. That is one of the possible reasons why your mattress is growing molds because there is no space between the mattress and the floor or the rug that you put the mattress on. In this situation, the mattress is highly likely to absorb the moisture of the rug or the floor. The best way to prevent mold developing under your mattress if this is the case is to flip the mattress every once in a while. However, you can only flip two-sided mattresses. Most memory foam mattresses in Canada are two-sided, so make sure to check them out.

It isn't just about being on the floor. Even if my mattress is on the bed, I realize that it may not get enough ventilation. That's because my bed's supporting slab doesn't allow the air to travel. So I try flipping my mattress or letting it air out occasionally.

Mattress Type

Among all the types of mattresses out there, two are famous for growing molds. The first and most important ones are innerspring mattresses. Innerspring mattresses have huge gaps in them where light can’t reach and usually, it gets too damp inside. It doesn’t matter if the mattress is hybrid or innerspring or if it has other layers. That one layer of coils that has air and moisture going through it where light can’t go is the place that molds are most likely to grow. It is warm there and it is definitely moist if you don’t take care of it. You should also make sure there is enough air flow in it. 

The second type is the memory foam mattresses since they absorb lots of moisture from the body and other sources. It also keeps moisture in it, and eventually guides the moisture towards the bottom of the mattress. The best thing to do is to flip and dry this mattress every once in a while.

Early Signs of Mold on Mattress

There are several early signs that can help you find out whether there are molds on your mattress or not. You should check for them every once in a while to make sure your mattress is healthy.

  • Black Dots. This is the first sign to know when they start to appear. When there are black dots in a large or small area of the mattress, you should be alarmed.
  • Distinguished Odor. When molds have grown more, you will start noticing an unpleasant smell. Molds smell like rotten food or damp places.
  • Health Issues. The last sign that is the worst one is when you have skin or respiratory problems but you cannot figure out what the cause is. You should check your mattress first. For people with allergies or asthma, molds are only going to worsen the situation. 

I sometimes have difficulty breathing, nothing severe though, yet mold can prove all the more dangerous for me. It can exacerbate my symptoms, meaning I may sneeze, cough, and have difficulty breathing while sleeping on the mattress. Although I haven't experienced it, I believe people who are very sensitive to allergens may get rashes or itching.

How to Remove Mold from Mattress

Now, if there are already molds on your mattress, you need to get working to get them eradicated as soon as possible. Don’t worry, as it is still not too late to save your beautiful mattress. Obviously, if you have one of the best mattresses in a box or the best mattresses for side sleepers in Canada, you are less likely to have molds growing on your mattress, due to the special structure of these mattresses, since they are mostly natural and won’t have such issues.

Now, back to eliminating the molds, you can use alcohol and hydrogen peroxide to get rid of them completely. These two solutions are very strong and will definitely work. The correct process to go through is as follows.

Step 1. Vacuum both sides of the mattress to get rid of the dust on it. 

Step 3. Scrub the mattress where the molds have grown with the solution and a clean piece of cloth. Then wash it again with water.

Step 4. Dry the mattress as efficiently as you can.

Step 5. Repeat until there are no molds left. 

If you are still not able to clean it, you can leave the mattress to a professional cleaner to do it for you. However, bigger mattress sizes might need several times this process done on them to actually get rid of the mold.


Can a mattress never grow mold?

If you take care of the mattress, keep it dry, and flip it every once in a while, it is completely possible. You should also pay attention to the mattress quality when you are purchasing one. Making this investment for your sleep quality is 100% worth it.

How to take care of my mattress if I have a one-sided mattress?

You can still dry your mattress regularly and keep it above the floor area in a place that is well-ventilated.


There it is, all you need to know about what can cause mold on mattress and how to take care of it when it happens. The best thing is to never panic, and prepare for cleaning and drying. Making sure you have all the necessary knowledge about your mattress is important, as well. So, try to prevent the molds from growing on your mattress in the first place. The first place to do a regular check is beneath your mattress, just in case. 

Thank you so much for reading this article. If you have any further questions about mattresses or molds, feel free to comment them down below. We’d love to hear about your experience.


  1. Kimberly Holland (November 28, 2018) Want to Kill Dangerous Bacteria? Open Your Blinds. Retrieved from

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