Throat cancer is caused primarily by tobacco use, heavy alcohol consumption, and infection with human papillomavirus (HPV). These three factors account for the vast majority of cases, though occupational exposures, chronic acid reflux, nutritional deficiencies, and rare genetic conditions also play a role. In 2026, an estimated 60,480 new cases of oral cavity and pharyngeal cancer will be diagnosed in the United States, with roughly 13,150 deaths.
Tobacco and Alcohol: The Dominant Risk Factors
Tobacco use is the single largest driver of throat cancer. Smoking cigarettes, cigars, or pipes exposes the lining of your throat to dozens of cancer-causing chemicals with every inhale. Smokeless tobacco, including chewing tobacco and snuff, carries its own risk because these products sit directly against the tissues of the mouth and upper throat. The longer and more heavily you use tobacco in any form, the greater the danger.
Alcohol is an independent risk factor, meaning it raises your risk even if you never touch tobacco. But the real concern is what happens when tobacco and alcohol are combined. Their effect on throat cancer risk isn’t simply additive. It’s multiplicative: the combined risk is roughly the product of each individual risk. In practical terms, one large study found that people who both drank heavily and smoked had a 300-times higher risk of oral and pharyngeal cancers compared to people who did neither. For laryngeal cancer (the voice box), studies have estimated the combined risk anywhere from 8 to more than 100 times higher than baseline, depending on consumption levels.
Why the combination is so dangerous comes down to biology. Alcohol acts as a solvent that makes the cells lining your throat more permeable, allowing tobacco’s carcinogens to penetrate tissue more easily. Alcohol metabolism also produces a compound called acetaldehyde, which damages DNA on its own.
HPV and the Rise of Virus-Linked Throat Cancer
Human papillomavirus, particularly HPV type 16, now causes the majority of cancers in one specific part of the throat: the oropharynx, which includes the base of the tongue and the tonsils. Over 90% of HPV-positive oropharyngeal cancers are caused by HPV-16. This type of throat cancer has been rising sharply in recent decades, especially among younger adults who may have no history of smoking or heavy drinking.
HPV is transmitted through sexual contact, including oral sex. Most people who contract HPV clear the virus on their own within a year or two. In a small percentage of cases, however, the virus persists in the cells at the base of the tongue or tonsils. Over time, the viral DNA integrates into the host cell’s genome and produces two proteins that disable the cell’s natural tumor-suppression machinery. With those safeguards turned off, cells can begin dividing uncontrollably.
The good news is that HPV-positive throat cancers tend to respond better to treatment than cancers driven by tobacco and alcohol. They’re also largely preventable through HPV vaccination, which is most effective when given before any sexual exposure to the virus.
Occupational and Environmental Exposures
Certain workplace exposures carry a well-documented link to laryngeal cancer. Asbestos is one of the most studied. A review by the Institute of Medicine concluded that the evidence is sufficient to confirm a causal relationship between asbestos exposure and laryngeal cancer. Workers with the highest levels of exposure face roughly double the risk compared to unexposed individuals, with some analyses estimating risk increases up to 2.5 times higher.
Strong sulfuric acid mist, commonly encountered in manufacturing and battery production, is another established cause of laryngeal cancer. Wood dust, formaldehyde, and certain paint fumes have also been investigated as potential contributors, though the evidence for these is less definitive than for asbestos and acid mists. If you’ve worked in construction, mining, manufacturing, or battery production for extended periods, these exposures may be relevant to your risk profile.
Chronic Acid Reflux
Gastroesophageal reflux disease, commonly known as GERD, has been linked to a modest but real increase in laryngeal cancer risk. When stomach acid repeatedly reaches the larynx, it exposes delicate tissue to acid and an enzyme called pepsin that can damage cells over time. A meta-analysis found that people with reflux disease had about 65% higher odds of developing laryngeal cancer compared to those without it. Reflux was also more common among laryngeal cancer patients (20%) than among lung cancer patients (14%), suggesting the association isn’t simply explained by shared risk factors like smoking.
That said, the increase in risk from GERD alone is far smaller than the risk from tobacco or alcohol. Reflux is more likely a contributing factor that compounds other exposures rather than a standalone cause.
Nutritional Deficiencies
A diet consistently low in certain vitamins may increase vulnerability to throat and oral cancers. Low vitamin B levels have shown the strongest signal, with one pooled analysis finding that people deficient in B vitamins had roughly twice the odds of developing oral cancer. Vitamin D deficiency has also been associated with higher risk in some studies, though the data is mixed.
Plummer-Vinson syndrome, a condition caused by severe iron deficiency, has long been recognized as a risk factor for cancers of the upper throat and esophagus. The syndrome causes tissue changes in the throat lining that can become precancerous over time. It’s rare in developed countries today because of improved nutrition, but it illustrates how chronic nutritional shortfalls can affect cancer risk in the throat.
Diets rich in fruits and vegetables appear to be protective, likely because of their combined antioxidant, vitamin, and fiber content rather than any single nutrient.
Genetic Conditions That Raise Risk
Most throat cancers are driven by environmental exposures, not inherited genes. But one rare genetic condition dramatically changes the equation. Fanconi anemia, an inherited disorder that impairs the body’s ability to repair damaged DNA, increases the risk of head and neck squamous cell cancer by 500 to 800 times. People with Fanconi anemia who develop throat cancer do so much earlier than the general population, with a median age of onset around 30.
Fanconi anemia is caused by mutations in any of 22 identified genes involved in DNA repair. It follows an autosomal recessive inheritance pattern in most cases, meaning a person needs to inherit a defective copy of the gene from both parents. The condition is rare, affecting roughly 1 in 100,000 to 200,000 births, but its outsized cancer risk makes early and ongoing screening essential for those diagnosed.
How Multiple Risk Factors Interact
Throat cancer rarely results from a single cause acting in isolation. The most important thing to understand is that risk factors stack, and in some cases they multiply each other’s effects. A person who smokes, drinks heavily, and has chronic reflux faces a dramatically different risk landscape than someone with just one of those factors. HPV-driven cancers are somewhat different in this regard, since they frequently occur in people with few or no other traditional risk factors.
Age and sex also matter. Throat cancers are two to four times more common in men, partly because of historically higher rates of tobacco and alcohol use, and partly because of differences in HPV exposure patterns. Most cases are diagnosed after age 55, with the notable exception of HPV-positive oropharyngeal cancers, which are increasingly appearing in people in their 40s and 50s.