Wet earwax is caused by a single gene. A gene called ABCC11 controls whether your earwax is wet and sticky or dry and flaky, and the wet type is the original, dominant version found in most humans. If you have wet earwax, you inherited at least one copy of the gene variant that produces it.
The Gene Behind Your Earwax Type
Your earwax type comes down to one tiny difference in your DNA. The ABCC11 gene contains a single-letter change (called a single nucleotide polymorphism) that swaps one amino acid for another in a transporter protein your cells use to move molecules across their membranes. The original version of this gene produces wet earwax. A mutated version, which arose roughly 2,000 generations ago in northeastern Asia, produces dry earwax instead.
Wet earwax is the dominant trait. That means you only need one copy of the wet variant (inherited from either parent) to produce wet, sticky earwax. To have dry earwax, you need two copies of the dry variant, one from each parent. This is why wet earwax is far more common globally: it’s the genetic default for our species.
How Your Ear Canal Makes Wax
Earwax is produced by two types of glands lining the outer portion of your ear canal. Ceruminous glands, a specialized type of sweat gland, secrete a watery fluid. Sebaceous glands add oily, fatty secretions. These two components mix together with dead skin cells and hair to form cerumen, the technical name for earwax.
The ABCC11 gene controls how actively the ceruminous glands transport lipids and other organic compounds into their secretions. When the gene’s transporter protein works at full capacity (the wet variant), the glands pump out more fats and pigments, producing earwax that’s moist, honey-brown, and sticky. When the transporter is less active (the dry variant), the glands secrete fewer of these compounds, resulting in pale, crumbly, dry wax.
Who Has Wet Earwax
Geography and ancestry are strong predictors of earwax type because the gene variants are distributed unevenly across populations. Roughly 95% of people with East Asian ancestry carry the dry earwax gene. In contrast, only 10 to 20% of people with European, African, or Native American ancestry carry it, meaning the vast majority of these populations have wet earwax.
The dry variant appears to have originated as a mutation in northeastern Asia and then spread outward through natural selection. Researchers estimate that individuals carrying the dry variant had about a 1% fitness advantage, enough to drive its spread over thousands of generations. Wet earwax is associated with warmer climates across Europe, Asia, and the Americas, while the dry variant is more common in cooler regions. The exact reason for this climate connection isn’t fully understood, but it likely relates to differences in how the body manages moisture and bacterial exposure in different environments.
The Earwax and Body Odor Connection
Here’s something most people don’t expect: the same gene that determines your earwax type also influences how much you sweat and how strong your body odor is. The ABCC11 transporter protein isn’t only active in your ear canal. It also operates in the apocrine sweat glands under your arms.
People with the wet earwax genotype produce higher concentrations of the chemical precursors that skin bacteria convert into body odor. Research on Japanese subjects found that the degree of underarm odor correlated directly with ABCC11 genotype. Those carrying two copies of the wet variant (G/G) or one of each (G/A) had stronger body odor, while those with two copies of the dry variant (A/A) produced significantly less. This is why many people of East Asian descent find they can skip deodorant entirely, and it’s also why earwax type has been studied as a quick screening indicator for body odor concerns in clinical settings.
So if you’ve ever noticed that your earwax is persistently wet and you also tend toward noticeable body odor, it’s not a coincidence. Both traits trace back to the same genetic switch.
When Wet Earwax Is Actually Discharge
Normal wet earwax is honey to dark brown, sticky, and doesn’t have a foul smell. It sits in the outer ear canal and typically works its way out on its own. But sometimes what looks like unusually wet earwax is actually fluid draining from deeper in the ear, which is a different situation entirely.
A few signs suggest you’re dealing with discharge rather than normal wax:
- Color changes: Thick yellow, green, or white fluid can signal an infection. A middle ear infection sometimes builds enough pressure to rupture the eardrum, causing a sudden release of yellow fluid, often preceded by intense pain that then improves.
- Blood: Fluid tinged with blood may indicate eardrum damage, a foreign object in the ear, or in rare cases following a head injury, fluid leaking from around the brain (a medical emergency).
- Foul smell: A persistent bad odor from ear drainage can point to a cholesteatoma, an abnormal growth of skin cells in the middle ear that requires treatment.
- Clear, watery fluid: This can result from eczema in the ear canal or, after trauma, from a more serious source.
If ear fluid is accompanied by fever, pain, hearing loss, dizziness, or visible redness and swelling, that’s not your genetics at work. Those are signs of infection or injury that need medical attention. Normal wet earwax, by contrast, is just your body doing its job: trapping dust and bacteria before they reach the sensitive structures deeper in your ear.
Factors That Affect How Wet Your Earwax Gets
Even among people with the wet earwax genotype, the consistency varies. Heat and humidity can make earwax softer and more liquid. Exercise increases secretions from the ceruminous glands temporarily, just as it increases sweat output elsewhere on the body. Stress can have a similar effect since apocrine-type glands respond to adrenaline.
Age plays a role too. Earwax production tends to increase during puberty (when apocrine glands become more active) and gradually decreases in older age, though the wax can become drier and harder as sebaceous gland output slows. This is why older adults sometimes experience more earwax buildup and blockages, even if they’ve had soft, self-clearing wax their whole lives.
Wearing earbuds or hearing aids for extended periods can also trap wax and moisture in the canal, making your earwax feel wetter and accumulate faster than it otherwise would. The wax itself hasn’t changed, but its ability to migrate out of the canal naturally gets disrupted.