Dust Mites in Pillows: Signs, How to Get Rid of Them, and What Helps

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If you wake up with a blocked nose, sneezing, or itchy eyes that settle once you're up and about, your pillow is one of the things worth looking at. Pillows sit closer to your nose, mouth and eyes than almost anything else in your home, for around a third of your life. This guide answers the questions people most often ask about dust mites in pillows — how to tell if they're there, how to reduce them, what actually works, and where a pillow cover fits in — drawing on peer-reviewed research and Australian guidance throughout.

Are there dust mites in my pillow?

Most likely, yes — and it's not a sign of poor hygiene. Dust mites are a normal part of nearly every indoor environment. They're found wherever three things come together: warmth, humidity, and a food source. A pillow supplies all three. It holds body heat, absorbs moisture from your breath and perspiration overnight, and collects the shed skin particles that dust mites feed on.

What people react to isn't the live mite. It's the protein found in dust mite waste particles and broken-down body fragments — typically 10–40 microns in size — which can become disturbed and inhaled while you sleep. Because pillows sit right at your airways, they're one of the most relevant items in the home for anyone sensitive to dust mites.

How many dust mites are in a pillow?

Exact numbers vary enormously between homes, climates and pillow age, so any single figure should be treated as illustrative rather than precise. What the research does establish is that pillows accumulate allergen over time, and that older bedding holds more. Dust mite allergen concentration in bedding is well documented in the peer-reviewed literature (Wilson and Platts-Mills, 2018), and reducing it measurably reduces exposure.

The practical takeaway matters more than the headline number: allergen builds up in pillows gradually, washing and barrier covers reduce it, and replacing a pillow that's several years old and no longer washable is a reasonable step. You don't need to count mites — you need a routine that keeps build-up down.

How do I know if dust mites are in my pillow? (signs)

Dust mites are microscopic — around 0.2–0.3 mm — so you can't see them, and they don't bite or leave visible tracks the way some pests do. Their presence is usually inferred from indirect signs rather than observed directly:

• Symptoms that are worse on waking: sneezing, a blocked or runny nose, or itchy, watery eyes first thing in the morning that ease within about half an hour of getting up.
• Symptoms that improve when you're away from the bedroom: if you feel noticeably better staying somewhere else, your bedding is a reasonable thing to look at.
• An old or rarely-washed pillow: the longer a pillow has gone without washing or a protective cover, the more allergen it's likely to hold.
• A musty smell or damp feel: this points to moisture, which is the condition dust mites (and mould) favour — worth addressing regardless of the cause.

None of these confirm dust mites on their own, because the same symptoms can come from other allergens or conditions. If you want certainty, an allergist can carry out a specific allergy test. For a fuller walkthrough of the signs, see our guide on how to tell if dust mites are in your bed, and if you're trying to work out whether bites are involved, dust mites vs bed bug bites.

How to get rid of dust mites in pillows

You can't eliminate dust mites from a pillow permanently — they're part of the indoor environment and will always return — so the realistic goal is to reduce them and keep build-up down with a routine. The most effective approach combines a few well-supported steps rather than relying on any single one. The peer-reviewed evidence is consistent on this: Wilson and Platts-Mills (2018) found "the odds of successful avoidance are much higher with multi-faceted approaches."

The steps that matter most for pillows specifically:

• Wash regularly, hot where you can: wash pillowcases and washable pillow protectors weekly to fortnightly. McDonald and Tovey (1992) found water at 55°C or above reduces dust mite populations in bedding; most Australian guidance suggests 60°C where care labels allow.
• Barrier the pillow: a tightly-woven, zippered pillow protector seals the pillow so existing allergen stays contained and new skin cells can't feed mites inside it.
• Control bedroom humidity: Arlian et al. (2001) found keeping indoor humidity below 51% over 17 months reduced dust mite populations by roughly 98%. A dehumidifier or air conditioning helps, and an air quality monitor lets you track it — this matters especially in humid coastal and subtropical parts of Australia.
• Replace very old pillows: if a pillow is years old, no longer washable, and never had a cover, replacing it and starting fresh with a protector is sensible.

Washing, freezing and drying — what actually works

This is where the important nuance lives, and it's the thing most quick answers get wrong. Killing dust mites and removing their allergens are two separate jobs.

• Hot washing does both — it kills mites and rinses away the allergen protein. Where the care label allows, it's the most complete option. Even a cold or warm wash is worthwhile: McDonald and Tovey (1992) found cold-cycle washing still removed more than 90% of allergen, even without killing the mites, because the allergen is simply rinsed away.
• Hot drying kills mites with heat. A hot dryer cycle is useful for items that can't be hot-washed — but on its own it doesn't remove the allergen already present, so pair it with washing where you can.
• Freezing is the fallback for things that can't be washed or heated — seal the item in a bag and freeze for 24 hours. It kills live mites, but, like drying, it doesn't remove the allergen. Follow it with a wash or a thorough air-out where the item allows.
• Sunlight and airing can help reduce moisture and mite numbers and is a reasonable supplement, though it shouldn't be your only method.

If your pillow itself can't be washed or hot-dried, the practical answer is a washable barrier cover over it: you then launder the cover rather than the pillow. Always follow the care label on both the pillow and the cover before applying heat. For the broader bedding picture, see how often to wash bedding and what reduces dust mites quickly.

Which pillows do dust mites live in?

Dust mites can be found in most pillow types — feather, down, cotton, wool, synthetic and blended-fill — because what attracts them is the warmth, moisture and skin cells, not the fill itself. Pillow material, age, how often it's washed, bedroom humidity, and whether it has a protective cover all influence how much allergen builds up.

So "hypoallergenic" fill alone isn't a complete answer. A synthetic pillow with no cover and no washing routine can still accumulate allergen; a feather pillow inside a tightly-woven encasement that's washed regularly can hold much less. The cover and the routine do more of the work than the fill label.

How pillow covers help (and how to use one)

A dust mite pillow cover — also called a pillow encasement or protector — is a tightly-woven, fully-zippered cover that seals the whole pillow. It does two things: it keeps the allergen already inside the pillow contained, and it stops fresh skin cells getting in to feed mites. The strongest evidence comes from a 2003 randomised controlled trial in the Journal of Allergy and Clinical Immunology (Halken et al., 2003), which found mattress and pillow encasings produced significant long-term reductions in dust mite allergen concentrations over 12 months.

The construction is what matters. The Wilson and Platts-Mills (2018) review found tightly-woven fabrics work as barriers while nonwoven materials don't — they put it plainly: "The fine woven fabrics are the correct material for pillow cases and for covers on duvets or comforters."

Using one is simple — it sits under your normal pillowcase:

1. Pillow goes inside the encasement.
2. Encasement zips fully closed around it.
3. Your normal pillowcase goes over the top, so it's the surface you sleep against.

Wash the pillowcase weekly with your sheets, and the encasement itself every 2–4 weeks. You typically can't feel the cover once the pillowcase is on.

Choosing a pillow cover that works

Not all "pillow protectors" are barrier covers. Many sold in department stores are loosely-woven polyester that only covers the top of the pillow — fine for general wear, but not designed to block allergen. For dust mite purposes, the features that matter are:

• Tightly-woven fabric (woven, not nonwoven) — this is the single most important factor.
• Small, tested pore size — smaller pores limit the movement of fine allergen particles. According to manufacturer testing, tightly-woven cotton encasements in this category are typically reported around 2–5 microns — below the 10–40 micron size generally cited for dust mite waste particles. Pore-size figures should be confirmed against the specifications for the specific product you choose.
• Full zippered encasement covering all sides, ideally with a flap over the zip.
• Washable at a useful temperature so you can clean it regularly.
• The right feel for you — cotton for breathability and natural fibre; a waterproof/TPU layer if you need spill protection (children's beds, for example), without losing breathability.

The full bedroom routine

Pillows are one piece of the picture. Dust mites build up across all the soft surfaces you sleep on and around, so the most effective results come from treating the bed as a whole and the bedroom around it:

• Cover all three bedding layers. Australian guidance from ASCIA recognises tightly-woven encasements on the mattress, pillow and quilt as part of broader dust mite reduction. Pair pillow protectors with mattress protectors and quilt and doona covers — or see the full dust mite covers range.
• Vacuum with a HEPA filter. Wu et al. (2012) found regular mattress vacuuming meaningfully reduced dust mite allergen. A HEPA-filtered vacuum helps capture fine particles rather than redistributing them.
• Run an air purifier overnight. A HEPA air purifier helps capture airborne particles in the bedroom.
• Keep humidity below 50%. The lever that affects whether mites thrive at all.

For the complete approach, see our room-by-room guide to reducing dust mites, the low-allergen bedroom guide, and our deep cleaning guide.

Frequently asked questions

How do I know if dust mites are in my pillow?

You can't see them — they're microscopic and don't bite or leave visible marks. The usual signs are indirect: allergy-type symptoms (sneezing, blocked nose, itchy eyes) that are worse on waking and ease after you get up, symptoms that improve when you sleep elsewhere, an old or never-washed pillow, or a musty, damp smell. None of these are conclusive on their own — an allergist can confirm a dust mite allergy with a specific test.

How do you get rid of dust mites in pillows?

Reduce rather than eliminate, using a combination: wash washable pillows and covers regularly (hot where the care label allows), use a tightly-woven zippered pillow encasement, keep bedroom humidity below 50%, and replace very old pillows that can't be cleaned. No single step removes them permanently, because mites are part of the indoor environment and return.

Does washing pillows kill dust mites?

Hot washing (55–60°C and above, where the care label allows) kills mites and rinses away their allergen. Importantly, even cold or warm washing removes most of the allergen — more than 90% in McDonald and Tovey's (1992) study — because the allergen is simply washed out, even though cooler water doesn't kill the mites themselves.

Does freezing a pillow kill dust mites?

Yes — sealing a pillow in a bag and freezing it for 24 hours kills live dust mites, and it's a useful option for items that can't be washed or hot-dried. But freezing doesn't remove the allergen the mites leave behind, so follow it with a wash or thorough airing where the item allows. The allergen, not the live mite, is what most people react to.

Can dust mites live in any type of pillow?

Yes. Feather, down, cotton, wool, synthetic and blended pillows can all hold dust mites, because mites are drawn to warmth, moisture and shed skin cells rather than the fill itself. A pillow's age, washing routine, bedroom humidity and whether it has a protective cover affect build-up more than the fill type does.

Do dust mite pillow covers actually work?

Research on dust mite encasements is encouraging. In a 2003 study, Halken et al. reported that mattress and pillow encasings were associated with reduced dust mite allergen concentrations in bedding over 12 months. That research looked at encasements in general, not any specific product. How useful a cover is in practice depends on tightly-woven (not nonwoven) fabric, a full zippered encasement, and regular washing — and individual results vary. A cover is a barrier to help reduce allergen exposure, not a treatment for any condition.

What's the difference between a pillow protector and an encasement?

The terms are often used interchangeably. Technically a "protector" can be any cover, while an "encasement" fully encloses all sides with a zip. For dust mite purposes you want a full encasement — a top-only protector doesn't seal the pillow. Many department-store "protectors" are loosely-woven and not designed as an allergen barrier.

How often should I wash a pillow cover?

Most allergy-aware households wash the pillow encasement every 2–4 weeks, and the normal pillowcase over the top weekly with the sheets. Where the care label allows, 60°C is most effective, but any wash temperature removes most allergen.

Do dust mite pillow covers help with pet dander and pollen too?

Yes — a tightly-woven cover limits the movement of various fine particles, including pet dander and pollen, not just dust mite waste. The same physical barrier works on all of them.

Do dust mites bite?

No. Dust mites don't bite, sting or burrow into skin. Reactions come from inhaling or contacting the allergen protein in their waste and body fragments, not from bites. If you're seeing what look like bites, that points to something else — our guide on bites: bed bugs or dust mites can help you tell the difference.

Where can I buy dust mite pillow covers in Australia?

Dust Mite Allergy Solutions is an Australian store shipping from a local warehouse. Our pillow protector range includes OEKO-TEX certified cotton and waterproof options with independently tested pore size and full-zip encasement, in sizes from cot through to European pillows.

Related guides

References

This article draws on the following peer-reviewed research and recognised guidance:

• McDonald LG, Tovey E. (1992). "The role of water temperature and laundry procedures in reducing house dust mite populations and allergen content of bedding." Journal of Allergy and Clinical Immunology, 90(4 Pt 1):599-608. PubMed
• Arlian LG, Neal JS, Morgan MS, et al. (2001). "Reducing relative humidity is a practical way to control dust mites and their allergens in homes in temperate climates." Journal of Allergy and Clinical Immunology, 107(1):99-104. PubMed
• Halken S, Høst A, Niklassen U, et al. (2003). "Effect of mattress and pillow encasings on children with asthma and house dust mite allergy." Journal of Allergy and Clinical Immunology, 111(1):169-176. PubMed
• Wu FF, Wu MW, Pierse N, Crane J, Siebers R. (2012). "Daily vacuuming of mattresses significantly reduces house dust mite allergens, bacterial endotoxin, and fungal β-glucan." Journal of Asthma, 49(2):139-143. PubMed
• Wilson JM, Platts-Mills TAE. (2018). "Home Environmental Interventions For House Dust Mite." Journal of Allergy and Clinical Immunology: In Practice, 6(1):1-7. PubMed
• Australasian Society of Clinical Immunology and Allergy (ASCIA), guidance on house dust mite allergen reduction.