Why Would a Mattress Be Wet Underneath? (SIX CAUSES)

Moisture can be disastrous to your bedroom. A wet mattress poses far-reaching health effects.

Moisture does not only cause the development of mold but also affects the mattress itself.

This can be a huge problem, considering how difficult it is to deal with moisture.

So, Why Would a Mattress Be Wet Underneath?

Several factors can cause your matter to be wet underneath, including leaks, humidity, pets, and sweating.

Six Possible Causes Of Wetness Underneath Your Mattress

Getting to the bottom of what causes wetness underneath your mattress is important. This is the surest way to figure out possible solutions.

Here are six possible reasons why your mattress gets wet underneath:

1. Sweating

Our bodies naturally sweat when sleeping. Unless it is intense, you do not need to worry about sweating at night.

It is a natural phenomenon. However, our bodies have varying degrees of sweating.

The vapor that comes from your skin can find its way around your bed and even under the bed and cause your mattress to become wet.

2. Incontinence

In simple terms, incontinence is bedwetting. It can occur during certain medications or if you fall ill.

Urine can flow right through the mattress and make it wet underneath. Incontinence is common in young kids. If you have a baby in your bed, there is every chance they will wet your mattress.

3. Spills And Accidents

Some folks love eating on the bed. So, if anything happens and your drinks spill on the mattress, it can get it.

The spills can overflow over the edge of your mattress and cause the underneath to become wet.

4. Humidity

Humidity is another major cause of wetness the underneath your mattress.

Water vapor can find its way under the mattress if your bedroom has high humidity.

The underside of the matter is usually one of the coolest spots in the bedroom, and water vapor can condense there.

5. Water Leaks

If there is a problem with your roofing or plumbing, water can leak out of it and land on your mattress.

Water leaks can become even more severe to the point of wetting the entire mattress. This will also depend on the location of the leak.

6. Pets

Pets can also wet your mattress in many ways.

If you let them play around the bedroom, they will leave traces of urine or moisture from their fur on the underside of your mattress.

Five Mattress Wetness Consequences

A wet mattress will cause discomfort in your bedroom and pose other significant problems.

Here are five things that can occur if your mattress gets wet on the underside:

1. Mold Growth

If your mattress becomes wet underneath, it will provide an ideal environment for mold to grow.

This will affect the mattress’s appearance and release harmful toxins into the air.

Mold releases allergic substances into the air and poses the threat of respiratory complications to the room’s occupants.

2. Foul Smell

A wet mattress can develop a musty smell that is difficult to remove.

The foul odor will make your bedroom smell unpleasant. It is usually challenging to eliminate a bad smell resulting from the moisture.

3. Discomfort

A wet mattress can become lumpy and uneven, making it uncomfortable to sleep on.

This can lead to poor sleep quality and can cause back and neck pain. It generally compromises your comfort in the bedroom.

4. Mattress Damage

Wetness will damage your mattress in the long run. Besides, it shortens its lifespan.

This will force you to get a replacement way too early. And considering how expensive mattresses are, the last thing you want to do is a replacement.

5. Allergies and Irritations

A wet mattress attracts dust mites and other pests, which can cause allergies and irritations to the skin.

As you may well know, allergies are problematic for people with sensitive skin or allergies. They might get seriously ill if they expose themselves to such conditions.

Allergies can also occur due to spores from molds. Spore allergies are a menace to people with breathing complications and those with asthmatic ailments.

How Can You Prevent Your Mattress From Getting Wet Underside?

You can take several steps to prevent your mattress from getting wet on the underside.

1. Use A Waterproof Mattress Protector

A waterproof mattress protector is a simple and effective way to dry your mattress. It can protect the mattress from spills and sweat.

All you have to do is hustle for an ideal protector. It would help if you looked for an appropriate size for your mattress.

They are usually available in different colors. So, if you want something to fit the theme in your bed, you can always find one that suits your needs.

2. Ventilate Your Bedroom

Ventilation is one of the surest ways of dealing with moisture in rooms. Good air circulation can help prevent humidity from building up in your bedroom.

There are many ways you can improve your bedroom’s ventilation.

Some of the easiest include opening windows, using a fan, and installing a dehumidifier.

3. Avoid Eating Or Drinking In Bed

Eating or drinking in bed can increase the risk of spills and stains.

You should, therefore, keep food and drinks away from your bed. The idea is to avoid accidents that may occur when eating or drinking.

4. Use A Mattress Pad

It benefits people who sweat a lot at night or those with incontinence issues.

Also, if you have kids or people with incontinence issues, a mattress pad is a handy material to contain their problem. You will not have to do regular cleaning of your sheets.

5. Keep Your Bed Clean

It would help if you cleaned your bed regularly to prevent moisture and stains from building up on your mattress.

Some of the easiest tasks include vacuuming, wiping surfaces and washing your sheets and pillowcases.

6. Address The Underlying Issues

One of the best and most decisive solutions is to address the underlying issues.

So, if you have incontinence issues, bedwetting, or other medical conditions that may cause moisture on your mattress, look for ways to address them.

You should seek consultation from your doctor.


As you have noted, there are many possible causes of wetness underneath your mattress.

It is essential to understand all these causes so that you can take the necessary steps to deal with them.

Keeping moisture away from your mattress is the best way to ensure that it lasts longer and offers the comfort you need.