Earwax overproduction happens when the glands lining your ear canal secrete more oil and sweat-like fluid than your ears can naturally clear out. About 10% of children and a similar percentage of adults develop enough buildup to cause a blockage at some point. The causes range from genetics and anatomy to skin conditions, aging, and even diet.
How Earwax Is Made
Two types of glands inside your ear canal work together to produce earwax. Sebaceous glands, attached to tiny hair follicles, secrete an oily substance called sebum that keeps the skin of your ear canal from drying out. Ceruminous glands, which are modified sweat glands, add antimicrobial proteins that protect your ears from bacteria and fungi. The mixture of these secretions, combined with dead skin cells and trapped dust, forms cerumen.
Under normal conditions, your ears are self-cleaning. Jaw movements from chewing and talking gradually push old wax toward the opening of the ear canal, where it dries up, flakes off, or falls out on its own. Overproduction happens when either the glands make too much material or something disrupts this natural conveyor belt.
Genetics and Earwax Type
Your genes play a surprisingly large role in how much earwax you produce. A single gene called ABCC11 determines whether you have wet or dry earwax. Wet earwax is sticky and yellowish brown to dark brown, while dry earwax is crumbly and gray to tan. People with the wet type have higher levels of the ABCC11 protein in their ear canal glands, which drives more active secretion. If you inherited the wet type from both parents, you’re more likely to deal with noticeable wax buildup throughout your life.
Most people of European and African descent have wet earwax, while dry earwax is more common in East Asian populations. The dry type results from a loss of function in the ABCC11 protein, meaning the glands simply produce less material overall.
Skin Conditions That Accelerate Buildup
Psoriasis and eczema are two of the most common medical causes of excess material in the ear canal. With psoriasis, an overactive immune system creates a rapid buildup of dead skin cells on the surface of the skin. When this happens on or inside the ear, those scales can flake off and collect in the canal, mixing with normal earwax to form a dense plug. This isn’t technically overproduction of wax itself, but the effect is the same: a blocked canal, muffled hearing, and discomfort.
Eczema causes similar problems through chronic inflammation. Inflamed skin in the ear canal sheds faster and can also trigger the sebaceous glands to ramp up oil production as a protective response. Scratching or putting fingers inside an irritated ear only makes things worse by pushing dead skin and wax deeper into the canal, where it compacts and hardens.
Anatomy of the Ear Canal
Some people are simply built in a way that makes wax accumulation more likely. Narrow ear canals leave less room for wax to migrate outward, so even a normal amount of production can cause a backup. Congenital stenosis (a canal that’s unusually narrow from birth) and acquired stenosis (narrowing from repeated infections or surgery) both increase the risk significantly.
Bony growths inside the ear canal, called exostoses or osteomas, create physical obstacles that trap wax behind them. Exostoses are particularly common in people who spend a lot of time in cold water, like surfers and swimmers. These growths don’t produce wax themselves, but they shrink the available space and disrupt the natural outward flow.
How Aging Changes Earwax
As you get older, the glands inside your ear canal undergo changes that alter the composition of your earwax. The wax becomes drier and harder, which makes it much more difficult for your ears to clear it through normal jaw movement. Instead of slowly migrating out, older, drier wax tends to stick to the canal walls and accumulate.
This is one reason earwax impaction becomes increasingly common with age. It’s not that older adults necessarily produce more wax. The wax they do produce is harder to move, so it builds up over months or years. Hearing aid use compounds the problem by physically blocking the canal opening and preventing wax from exiting naturally.
Habits That Contribute to Buildup
Cotton swabs are one of the most common culprits. Rather than removing wax, they push it deeper into the ear canal and pack it tightly against the eardrum. Over time, this creates a hard plug that your ear has no way to clear on its own. Earbuds, earplugs, and hearing aids all have a similar effect to a lesser degree, since they block the canal opening and can push wax inward with repeated insertion.
People who wear in-ear devices for several hours a day are at higher risk for impaction, even if their glands produce a perfectly normal amount of wax. The issue isn’t overproduction but obstruction of the natural clearing process.
Diet and Earwax Production
The link between food and earwax is mostly anecdotal, but there is a plausible biological mechanism. Diets high in fat can increase sebum production throughout the body, including in the sebaceous glands of the ear canal. Since sebum is a major component of earwax, more sebum can mean a higher volume of wax. Spicy foods may have a similar effect by temporarily boosting oil secretion.
People with the wet earwax type appear to be more susceptible to diet-related changes in wax production, since their earwax already contains a higher proportion of sebum. That said, no rigorous clinical studies have confirmed a strong cause-and-effect relationship between specific foods and earwax volume, so dietary changes alone are unlikely to solve a significant buildup problem.
When Overproduction Leads to Impaction
Earwax becomes a medical issue when it fully blocks the canal, a condition called cerumen impaction. Symptoms include a feeling of fullness in the ear, partial hearing loss, ringing (tinnitus), earache, and occasionally dizziness. Prevalence rates vary widely depending on the population studied. In developed countries, about 10% of children experience impaction, while rates in developing countries range from 7% to as high as 63%, likely reflecting differences in access to ear care.
Most cases of impaction aren’t caused by a single factor. They result from some combination of naturally high production, ear canal shape, skin conditions, aging, and habits like cotton swab use. Identifying which factors apply to you is the first step toward managing recurring buildup, whether that means avoiding in-ear devices, treating an underlying skin condition, or scheduling periodic professional cleaning.