Can Clothes Cause Cancer? What the Science Says

Clothing contains a cocktail of synthetic chemicals, some of which are known or suspected carcinogens, but for the average person wearing ordinary clothes, the cancer risk from those chemicals appears to be very low. The more honest version of the answer is that the risk depends heavily on which chemicals are present, how much skin contact you have, how often you sweat in your garments, and how long you wear them without washing. Researchers have found that certain textile chemicals can migrate through fabric, dissolve into sweat, and cross the skin barrier, yet most consumer risk assessments place the resulting exposure well below thresholds considered dangerous. The gap between “these chemicals exist in your clothes” and “your clothes will give you cancer” is wide, but it is not empty.

What Is Actually in Your Clothes

The list of chemicals that can end up in finished garments is surprisingly long. A 2025 critical review covering evidence from 2019 to 2025 highlighted three categories of particular concern: phthalates in infant clothing, per- and polyfluoroalkyl substances (PFAS) in water-repellent fabrics, and carcinogenic aromatic amines released by azo dyes.¹ Each of these gets into clothing for a different reason, and each carries a different kind of risk.

Azo dyes are the largest class of dyes used in textile manufacturing. They give clothes their color, but bacteria living naturally on your skin can break them down into smaller molecules called aromatic amines. Some of those amines are genotoxic or carcinogenic. The European Union has banned azo dyes that release any of 22 known carcinogenic aromatic amines, but researchers have identified additional amines, not yet on the banned list, that may also pose a mutagenic risk.² So even in markets with decent regulation, some potentially hazardous breakdown products may slip through.

Formaldehyde is another common offender. It is used in resin finishes that make shirts “wrinkle-free” or “easy-care.” Formaldehyde is classified as a human carcinogen based primarily on inhalation exposure, but in clothing it mainly causes skin problems. A study of garments for pregnant women, babies, and toddlers sold in Spain found formaldehyde in about one in five samples, at a mean level of roughly 9 mg/kg.³ For people allergic to formaldehyde, even low-level release from wrinkle-free garments can trigger contact dermatitis.⁴

PFAS, the so-called “forever chemicals,” appear in water-repellent outdoor jackets, stain-resistant pants, and similar performance fabrics. Research on multi-layer outdoor jackets has shown that outdoor exposure causes fluorine to migrate from the treated outer layer inward toward the fabric touching your skin.⁵ PFAS exposure has been linked to various health problems, including certain cancers, though most of that evidence comes from drinking-water contamination and occupational settings rather than clothing specifically.

Then there are bisphenols. Bisphenol A (BPA) and bisphenol S (BPS) are endocrine disruptors that have turned up in a range of everyday garments. One study found BPA and BPS in virtually all pantyhose tested across six countries, with some brands containing BPS at concentrations in the milligrams-per-gram range.⁶ Socks tend to carry especially high levels. A study focused on infant clothing found BPA concentrations as high as 13,300 ng/g in a polyester sock marketed for babies.⁷ Bisphenols are not classified as outright carcinogens in the way aromatic amines are, but their endocrine-disrupting activity is a concern in its own right, and ongoing research continues to probe links to hormone-sensitive cancers.

How Chemicals Travel From Fabric to Body

Finding a chemical in a piece of fabric is not the same as finding it inside the person wearing that fabric. The question is whether those chemicals actually leave the textile and enter the body, and the answer for many of them is yes, at least in small amounts. A 2024 study examined several halogenated textile pollutants and showed that all of them migrated from fabric into artificial sweat and were absorbed through skin in lab tests, though the amounts varied widely from compound to compound.⁸

Sweat is the key intermediary. When you perspire, the moisture dissolves chemicals sitting on or within the fabric, creating a solution that sits directly against your skin. Heavy metals in clothing follow the same pathway. Research simulating dermal exposure with acidic artificial sweat found that metals like zinc, copper, chromium, and nickel leached from infant garments in measurable quantities. Chromium was especially mobile, with about 38% of its total content becoming bioaccessible under those conditions.⁹ Hexavalent chromium is a recognized carcinogen when inhaled, though its cancer risk through skin absorption at clothing-level doses is far less established.

For azo dyes, the pathway is slightly different. The dye itself may not be harmful, but skin bacteria or enzymes in the body can cleave the dye’s chemical bonds after it has already been absorbed, releasing aromatic amines inside the body.¹⁰ This means the cancer-relevant exposure is not to the dye itself but to what the body converts it into. It also means the risk is hard to predict from simply measuring the dye concentration in a garment.

Clothing also acts as a sponge for chemicals in your environment. Cotton and polyester fabrics left in indoor air for 30 days accumulated thousands of nanograms per square decimeter of phthalates and hundreds to over a thousand nanograms per square decimeter of organophosphate flame retardants, just from ambient air exposure.¹¹ Your clothes are not just delivering chemicals from the factory; they are also collecting chemicals from your home and workplace and holding them against your skin.

What the Risk Assessments Actually Say

Here is where the picture becomes more reassuring, at least for most people. When researchers have tried to calculate the actual cancer risk from wearing clothes, the numbers tend to land below internationally accepted danger thresholds. A study that measured trace elements in textiles and estimated the resulting dermal exposure found that both the non-carcinogenic and carcinogenic risks fell within safe and acceptable limits by international standards.¹²

But “generally safe” comes with caveats. A broader review of inorganic and organic chemicals in textiles concluded that under specific circumstances of exposure, some chemicals in clothing could mean non-assumable cancer risks for consumers.⁶ Those specific circumstances include garments with unusually high chemical concentrations, prolonged direct skin contact with sweating, and populations that are especially vulnerable because of their size or biology. In practice, the risk to a healthy adult wearing a cotton shirt to work is vanishingly small. The risk picture changes when you start talking about infants, occupational settings, or certain product categories.

Infants and Children Get a Bigger Dose

Babies and toddlers face higher exposure for simple mathematical reasons: they are small. When you express a chemical dose relative to body weight, the same absolute amount of a substance translates into a much larger dose for a 5-kilogram infant than for a 70-kilogram adult. Children also tend to mouth their clothing and have thinner, more permeable skin.

Calculated dermal exposure to BPA in infants via textiles was estimated to reach as high as 7,280 picograms per kilogram of body weight per day in the study that found extreme BPA concentrations in polyester infant socks.⁷ The formaldehyde study from Spain found that its presence in baby and toddler garments was common enough to warrant specific risk assessments for these age groups.³ Whether these exposures are large enough to cause harm over a lifetime is an open question, but they are clearly proportionally larger than what adults experience from the same garments.

Occupational Exposure Is a Different Story

The strongest evidence linking textiles to cancer comes not from wearing clothes but from making them. Textile-industry workers face exposures that are orders of magnitude higher than consumers, through inhaling dye dust, handling untreated chemicals, and spending eight-hour shifts in poorly ventilated factories. A review of the occupational cancer literature found associations between textile-industry employment and cancers of the lung, bladder, colon and rectum, and breast.¹³ These associations reflect chronic, high-level exposure to many chemicals at once, a scenario fundamentally different from wearing a finished shirt.

Firefighters represent another high-exposure group, though their situation is unusual. Structural firefighting gear traditionally uses PFAS-based coatings for water and oil repellency. Research has shown significant amounts of PFAS on turnout gear and demonstrated that these chemicals migrate to inner layers that contact the skin.¹⁴ Studies testing both PFAS-based and non-PFAS alternatives found that the coatings degrade and shed from fabrics during simulated on-the-job wear.¹⁵ This is combined with heat and sweating that accelerate skin absorption, making the dermal route particularly relevant for firefighters. Several jurisdictions are now phasing PFAS out of firefighting gear precisely because of this concern.

Microfibers and the Inhalation Route

Most discussions about clothing and cancer focus on skin absorption, but there is a growing body of research on what happens when you breathe in tiny fibers shed by synthetic garments. Every time you do laundry, dry clothes, or even just move around in synthetic fabrics, microscopic fibers are released into the air. A 2026 study exposed mice to textile washing-machine lint microfibers over 90 days and found dose-dependent lung inflammation, increased immune-cell counts, and structural changes in the bronchial lining including hyperplasia of mucous-producing cells.¹⁶ The researchers attributed the inflammation to lung immune cells that tried and failed to break down the fibers, a process called frustrated phagocytosis.

Chronic lung inflammation of this kind is a recognized risk factor for cancer development over time, but whether microfiber inhalation from normal clothing use reaches levels that could meaningfully contribute to cancer risk in humans is not yet clear. The mouse study used controlled doses delivered directly to the airways, which is a more intense exposure than a person would typically experience at home. Still, the findings give researchers reason to keep looking.

Recycled and “Eco-Friendly” Clothing Is Not Automatically Safer

If your instinct is to reach for recycled polyester or garments labeled “eco-friendly,” the chemistry is unfortunately not that simple. A study analyzing bisphenols in clothing made from both conventional and recycled materials found the highest BPA concentration, 625 ng/g, in a pair of recycled-fabric socks. BPA was undetectable in only two samples out of the entire set, both of which were 100% cotton T-shirts with no recycled content.¹⁷ Recycled polyester often comes from sources like plastic bottles that may carry chemical residues, and the recycling process itself can introduce or concentrate certain contaminants.

The Spanish formaldehyde study found an even more counterintuitive result: formaldehyde levels were higher in garments labeled eco-friendly than in regular ones, averaging 10.4 mg/kg versus 8.2 mg/kg.³ The researchers noted that “eco” labels often focus on environmental metrics like organic cotton sourcing or reduced water use, not on the chemical finishes applied to the final product. This disconnect between marketing and chemical safety is something shoppers generally have no way to detect.

Textile recycling processes face their own challenges. Chemical finishes like flame retardants applied to workwear persist through recycling and require additional treatment to remove. Life-cycle assessments have examined whether removing such finishes before recycling is worth the environmental cost, but the fact that they need removing at all underscores a broader point: the chemicals in clothing do not simply vanish when a garment reaches the end of its life.

Regulatory Gaps and Compliance Failures

The European Union has the most comprehensive regulatory framework for textile chemicals, centered on the REACH regulation, but compliance is far from universal. A 2025 study testing clothing, textiles, and footwear found that roughly a quarter of samples would exceed proposed concentration limits for bisphenols, about one in five were non-compliant with REACH limits for phthalates and polycyclic aromatic hydrocarbons, and 7% contained a skin-sensitizing preservative above proposed safe limits.¹⁸ On the positive side, PFAS and isocyanates in the tested garments fell within the proposed or established limits.

Outside of Europe, regulation is patchier. The United States has no federal law specifically restricting chemicals in clothing. Some states have enacted their own PFAS restrictions, but enforcement is limited and the textile industry is globalized, meaning your shirt may have been manufactured in a country with few chemical-safety standards and sold in a market with few testing requirements. Third-party certification programs exist to fill the gap. OEKO-TEX Standard 100, for example, tests for a wide range of harmful substances and certifies products that meet its limits.¹⁹ These certifications are voluntary, though, and the cost of testing means they are more common on premium garments than on fast-fashion basics.

Practical Ways to Reduce Your Exposure

Washing new clothes before wearing them is the single most effective step you can take. Many of the chemicals detected in textile studies are water-soluble or loosely bound to fabric surfaces, so a wash cycle removes a significant fraction of them before they ever touch your skin. This is especially worth doing for infant clothing, deeply colored garments, and anything labeled wrinkle-free or water-repellent.

Beyond that first wash, a few other habits help:

• Choose natural fibers when possible: 100% cotton garments consistently tested lowest for bisphenols and many industrial additives in the studies cited above. Cotton is not chemical-free, but it starts with fewer synthetic additives than polyester blends.
• Be skeptical of performance finishes: water-repellent, stain-resistant, wrinkle-free, and antimicrobial treatments all involve chemical coatings. If you do not actually need the performance feature, you are carrying chemical exposure for no benefit.
• Look for third-party certifications: OEKO-TEX Standard 100 and similar programs test for a specific list of restricted substances. These labels are not a guarantee of zero exposure, but they indicate the garment has been screened.
• Ventilate your laundry area: if microfiber inhalation concerns you, running a dryer with a well-maintained lint filter and ensuring good airflow in the room where you fold clothes reduces airborne fiber exposure.

The evidence does not support panic about your wardrobe. The doses reaching your skin from ordinary garments are generally tiny, and your body’s own detoxification processes handle low-level chemical exposures constantly. Where the science points to genuine caution is in specific product categories, specific populations, and specific occupational settings. For everyone else, washing your clothes before you wear them and choosing less-treated fabrics when you can are proportionate responses to a real but modest risk.

Why the Research Is Harder Than It Looks

One reason this topic stays murky is that studying the cancer risk from clothing is exceptionally difficult. Cancer develops over decades, and no one wears the same shirt for 30 years. People are simultaneously exposed to chemicals from food packaging, air pollution, household products, and dozens of other sources, making it nearly impossible to isolate the contribution of textile chemicals alone. Researchers can measure what migrates off a fabric in a lab dish, and they can calculate a theoretical dermal dose, but connecting that dose to an actual cancer outcome in a human being requires epidemiological studies that control for everything else, which essentially do not exist for clothing-specific exposure.

Most of what we know comes from occupational studies of factory workers, animal toxicology experiments, and in-vitro tests that show whether a chemical damages DNA. These data inform risk assessments, but they involve assumptions about how much skin contact a typical consumer has, how often they sweat, and how efficiently the skin absorbs each compound. Those assumptions can shift the final risk estimate by an order of magnitude in either direction. The field is also contending with the fact that regulations have not kept pace with the number of chemicals in use. Researchers have identified mutagenic aromatic amines from azo dyes that are not yet on any banned list, and new substitute chemicals are introduced faster than safety data can accumulate.² The science is always playing catch-up with the chemistry.