Head and neck cancers are caused primarily by tobacco use, alcohol consumption, and certain viral infections, with the specific cause often depending on where in the head or neck the cancer develops. About 60,480 new cases of oral cavity and pharynx cancer alone are expected in the United States in 2026, and incidence has been climbing roughly 1% per year over the past decade. Men are twice as likely as women to be diagnosed, with a median age at diagnosis of 65.
Tobacco and Alcohol: The Strongest Risk Factors
Tobacco use in any form is the single biggest driver of head and neck cancers. Cigarettes, cigars, pipes, and smokeless tobacco all expose the cells lining your mouth, throat, and voice box to cancer-causing chemicals. The risk rises with the amount you use and the number of years you’ve used it.
Alcohol multiplies the problem. Drinking heavily on its own raises your risk, but combining heavy drinking with heavy smoking pushes the risk to an entirely different level. A large meta-analysis found that people who both drink and smoke heavily face roughly 35 times the risk of head and neck cancer compared to people who do neither. Even light drinking paired with moderate smoking produced about a four-fold increase. The two substances don’t simply add their effects together; they interact in a way that makes the combination far more dangerous than either one alone. Alcohol may act as a solvent that helps tobacco’s carcinogens penetrate the cells lining the mouth and throat more easily.
HPV and Throat Cancer
Human papillomavirus, particularly strains 16 and 18, has become the leading cause of cancers in the oropharynx, which includes the base of the tongue and the tonsils. Around 85% of oropharyngeal cancers test positive for a high-risk HPV strain. This type of head and neck cancer has been rising steadily, especially among younger men who don’t fit the traditional profile of heavy smokers or drinkers.
HPV-related oropharyngeal cancers tend to respond better to treatment than those caused by tobacco and alcohol, and they’re increasingly recognized as a distinct disease. The HPV vaccine, originally developed to prevent cervical cancer, also protects against the strains responsible for these throat cancers. Vaccination is most effective when given before any exposure to the virus, which is why it’s recommended in the preteen years.
Epstein-Barr Virus and Nasopharyngeal Cancer
Nasopharyngeal cancer, which forms in the upper part of the throat behind the nose, follows a different pattern. It’s strongly linked to the Epstein-Barr virus (EBV), the same virus that causes mononucleosis. Most people carry EBV without any problems, but in certain populations, particularly in Southeast Asia and southern China, infection combines with other factors to trigger cancer.
One of those factors is diet. The World Health Organization classifies Chinese-style salted fish as a Group 1 carcinogen, the same category as tobacco. Preserved foods high in nitrosamines may help EBV infect the cells lining the nasopharynx more effectively. Genetic susceptibility plays a role too, which helps explain why nasopharyngeal cancer clusters in specific ethnic populations even when they migrate to other countries.
Betel Quid and Areca Nut
In parts of South and Southeast Asia, the Pacific Islands, and some East African communities, chewing betel quid (a preparation that typically includes areca nut, slaked lime, and sometimes tobacco wrapped in a betel leaf) is a major cause of oral cancer. The WHO has classified both betel quid and areca nut as carcinogenic to humans. Areca nut causes a precancerous condition called oral submucous fibrosis, in which the tissues of the mouth become stiff and scarred. This condition can progress to cancer over time. Hundreds of millions of people worldwide chew some form of betel quid, making it one of the most significant head and neck cancer risk factors globally, even though it receives less attention in Western countries.
Acid Reflux and Laryngeal Cancer
Chronic acid reflux, also known as gastroesophageal reflux disease (GERD), may contribute to cancers of the larynx (voice box). A large study using data from more than half a million participants found that acid reflux disease was associated with roughly double the risk of laryngeal and esophageal squamous cell cancers. The likely mechanism is straightforward: stomach acid repeatedly washing over the delicate tissue of the voice box causes chronic irritation and cell damage over years or decades. This link is still being investigated, but it’s one more reason persistent reflux deserves treatment rather than being dismissed as a nuisance.
Oral Health and Its Amplifying Effect
Poor oral hygiene doesn’t cause head and neck cancer on its own, but it appears to amplify other risk factors. Chronic gum disease and poor dental health seem to magnify the cancer-causing effects of smoking, chewing tobacco, and heavy alcohol use. One analysis of nearly 3,500 people also found a strong link between self-rated poor oral health and HPV infection, which could further raise risk for oropharyngeal cancer. Keeping your teeth and gums healthy won’t eliminate cancer risk, but it may reduce how much damage other carcinogens can do to the tissues in your mouth and throat.
Genetic Conditions That Raise Risk
A small number of inherited conditions dramatically increase susceptibility to head and neck cancer. The most notable is Fanconi anemia, a rare genetic syndrome that impairs the body’s ability to repair damaged DNA. People with Fanconi anemia face an estimated 700-fold increase in their risk of developing head and neck squamous cell carcinoma compared to the general population. Dyskeratosis congenita, another rare inherited syndrome, carries a similar elevated risk. These conditions are uncommon, but they illustrate how DNA repair failures can make cells in the mouth and throat especially vulnerable to becoming cancerous.
Why the Location Matters
Head and neck cancer is really a collection of different cancers, and each site has a somewhat different risk profile. Cancers of the oral cavity (mouth, tongue, gums, floor of the mouth) are most closely tied to tobacco, alcohol, and betel quid. Oropharyngeal cancers (tonsils and base of the tongue) are increasingly driven by HPV. Laryngeal cancers are linked to smoking, alcohol, and possibly chronic acid reflux. Nasopharyngeal cancers are driven by EBV, preserved food consumption, and genetic factors. Understanding where a cancer develops often points directly to what caused it, and this distinction also shapes treatment decisions and outcomes.
Multiple risk factors often overlap in the same person. Someone who smokes, drinks heavily, and has poor oral health faces a compounding set of risks that is far greater than any single factor alone. Reducing even one of those exposures, particularly tobacco, substantially lowers the overall threat.