What Is Ear Wax and What It Does
, by Andrew Odgers, 17 min reading time
Ear Wax Removal Knowledge Hub
What Is Ear Wax and What Does It Do?
The science behind cerumen — what it is made of, why your ears produce it and when it becomes a problem worth treating.
Ear wax — known clinically as cerumen — is one of the most misunderstood substances in the human body. It is routinely described as dirty, unhygienic or something to be eliminated, when in fact the opposite is closer to the truth. Cerumen is a sophisticated, multifunctional secretion that cleans, lubricates and protects the ear canal. Its absence — not its presence — is associated with dry, itchy, infection-prone ears.
Approximately 60% of cerumen by composition is shed skin cells (keratin), with the remainder made up of long-chain fatty acids, cholesterol, alcohols and squalene produced by two types of modified gland in the outer third of the ear canal: sebaceous glands and apocrine (modified sweat) glands. This combination gives wax its characteristically waxy, slightly sticky texture and its distinctive mildly acidic pH — a chemical environment that inhibits bacterial and fungal growth.
What Ear Wax Actually Does
- Traps dust, debris, insects and foreign particles before they reach the eardrum
- Waterproofs the canal lining — repels moisture that would otherwise cause maceration
- Antibacterial and antifungal — mildly acidic pH inhibits microbial growth
- Lubricates the canal skin — prevents dryness, itching and micro-cracking
- Self-cleaning — migrates outward carrying dead skin cells and debris
- Reduces the viability of influenza virus and Staphylococcus aureus
60%Of cerumen is shed skin cells (keratin) by composition
Slightly acidicpH of healthy ear wax — inhibits bacterial and fungal growth
3mm/weekApproximate rate of epithelial migration outward from the eardrum
2 typesOf gland produce cerumen: sebaceous and apocrine
The Composition of Ear Wax
Cerumen is not a single substance but a mixture produced by two distinct glandular secretions that combine in the outer third of the ear canal with shed epithelial cells and hair. Its composition varies between individuals and between ethnic groups.
| Component | Approximate Proportion | Function |
|---|---|---|
| Shed skin cells (keratin) | ~60% | Structural bulk of wax; carries debris outward |
| Long-chain fatty acids | ~12–20% | Waterproofing and antimicrobial properties |
| Cholesterol | ~6–9% | Contributes to wax viscosity and protective film |
| Squalene and other alcohols | ~5–8% | Lubricates canal lining, prevents drying |
| Sebaceous secretions | Variable | Oily component from sebaceous glands |
| Apocrine secretions | Variable | Aqueous component from modified sweat glands |
Wet Ear Wax vs Dry Ear Wax
There are two genetically determined types of ear wax. The difference is controlled by a single gene (ABCC11) with a dominant allele for wet wax. Both types are completely normal and neither indicates a health problem.
Wet Ear Wax
Sticky, honey-brown to dark orange or dark brown in colour. More common in people of African and European descent. Contains a higher proportion of lipid compounds and is softer at body temperature. More likely to migrate outward naturally due to its fluid consistency. Associated with the presence of apocrine body odour glands.
Dry Ear Wax
Flaky, grey or pale beige in colour. More common in people of East Asian and Native American descent — approximately 80 to 95% of individuals in these populations have dry wax. Less adhesive than wet wax. Can be more prone to accumulating in the canal rather than migrating outward in individuals with certain canal shapes.
Prevalence of Wet vs Dry Ear Wax by Ancestry Group
Approximate prevalence of wet-type cerumen within each ancestry group. Dry wax is determined by two copies of the recessive ABCC11 allele. Both types are normal — neither requires treatment.
How the Ear Cleans Itself: Epithelial Migration
The ear canal does not need cleaning with cotton buds or any implement because it cleans itself continuously through a process called epithelial migration. The skin lining the canal grows outward from the eardrum at approximately 3mm per week — roughly the same rate as a fingernail. As the skin migrates, it carries wax, dead cells and trapped debris toward the canal opening, where it dries and flakes away.
Jaw movement — chewing, talking and yawning — accelerates this process by repeatedly flexing the canal and dislodging wax. This is why ear problems related to wax are more common in people who eat soft food diets and in those with temporomandibular joint dysfunction that limits jaw movement.
Disrupting this migration with cotton buds or other objects counteracts the self-cleaning mechanism, pushes wax back toward the eardrum and stimulates ceruminous glands to produce more wax in response to the perceived intrusion.
When Ear Wax Becomes a Problem
In approximately 2.3 million people in the UK each year, wax accumulates faster than the ear can clear it, leading to partial or complete canal occlusion. This is called cerumen impaction and it is entirely distinct from the normal presence of wax in the ear. It is the accumulation that causes symptoms — not the wax itself.
- Conductive hearing loss — wax physically blocks sound waves from reaching the eardrum
- Tinnitus — pressure on the eardrum or interference with sound transmission causes ringing or buzzing
- Ear fullness and pressure — the sensation of a blocked or stuffed ear
- Earache — wax pressing against the eardrum or causing canal irritation
- Vertigo or dizziness — in cases of significant impaction affecting the vestibular system
Key point: The presence of ear wax is not a problem. A healthy ear always contains some cerumen — it is doing its job. Treatment is only warranted when wax build-up causes symptoms or when a clinician needs a clear view of the eardrum. Routine removal of symptom-free wax is unnecessary and may be counterproductive.
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