Head and neck cancer is a group of cancers that develop in the mouth, throat, voice box, sinuses, or salivary glands. The vast majority begin in squamous cells, the flat cells that line the moist surfaces inside these areas. Because of that, most head and neck cancers are technically squamous cell carcinomas. Cancers starting in the salivary glands, sinuses, or muscles and nerves of the head and neck are far less common.
Where These Cancers Develop
Head and neck cancer isn’t a single disease. It’s named by location, and the location shapes everything from symptoms to treatment to outlook. The main sites include:
- Oral cavity: the lips, front two-thirds of the tongue, gums, inner lining of the cheeks, floor of the mouth, and hard palate (the bony roof of the mouth).
- Throat (pharynx): a roughly five-inch tube running from behind the nose down to the esophagus. It’s divided into three zones: the nasopharynx (behind the nose), the oropharynx (the middle section, including the tonsils, soft palate, and base of the tongue), and the hypopharynx (the lowest section).
- Voice box (larynx): the short cartilage passageway just below the throat that holds the vocal cords.
- Nasal cavity and sinuses: the hollow space inside the nose and the small air-filled pockets in the surrounding bones.
- Salivary glands: located in the floor of the mouth, near the jawbone, and scattered throughout the lining of the mouth and throat.
Each of these locations behaves differently. Oropharyngeal cancers, for instance, are increasingly driven by HPV infection, while cancers of the floor of the mouth are more closely tied to tobacco and alcohol use.
Major Risk Factors
Tobacco and alcohol are the two biggest risk factors, and they don’t just add up. Using both together multiplies the danger: the combined effect raises the risk of oral cancer roughly 15-fold, with the floor of the mouth especially vulnerable. This applies to all forms of tobacco, including cigarettes, cigars, pipes, and smokeless products.
HPV, particularly the same strains prevented by the HPV vaccine, is now the dominant cause of oropharyngeal cancer. An estimated 60% to 70% of oropharyngeal cancers in the United States are linked to HPV infection. These HPV-driven cancers tend to appear in younger, non-smoking patients and generally carry a better prognosis than cancers caused by tobacco. The HPV vaccine protects against the strains responsible, which means it has the potential to prevent these cancers altogether when given before exposure to the virus.
Other risk factors vary by location. Nasopharyngeal cancer is associated with Epstein-Barr virus infection and is more common in parts of East and Southeast Asia. Prolonged sun exposure raises the risk of lip cancer. Poor oral hygiene, a diet low in fruits and vegetables, and certain occupational exposures (wood dust, for example) also play a role in specific subtypes.
Common Symptoms
Symptoms depend on where the cancer forms, but many overlap with everyday problems like sore throats or mouth sores. The difference is persistence. A sore in the mouth that doesn’t heal within two to three weeks, a sore throat that won’t go away, or a hoarse voice that lingers should prompt a closer look.
Other warning signs include a lump or thickening in the cheek, difficulty chewing or swallowing, a feeling that something is stuck in the throat, numbness in the tongue or other parts of the mouth, swelling in the jaw, a persistent earache on one side, or a lump in the neck. Nasal symptoms like chronic stuffiness, nosebleeds, or sinus pressure that doesn’t respond to treatment can point to cancers in the nasal cavity or sinuses. White or red patches inside the mouth that don’t resolve are also worth having examined.
Many of these symptoms are far more likely to be caused by something harmless. But when any of them stick around for weeks without improvement, that timeline itself is the signal to get it checked.
How It’s Diagnosed
Diagnosis typically starts with a physical exam of the mouth, throat, and neck, often followed by an endoscopy, where a thin, flexible camera is passed through the nose or mouth to get a close look at areas that aren’t easily visible. Imaging, usually a CT scan, MRI, or PET scan, helps determine the size and spread of a suspicious area. A biopsy, removing a small tissue sample for analysis under a microscope, confirms the diagnosis.
For oropharyngeal cancers, the biopsy sample is also tested for HPV (specifically a marker called p16). HPV status matters because it changes both the expected outcome and, in some cases, the treatment approach.
The Role of Dental Exams in Early Detection
Your dentist is often the first person to spot something suspicious. The American Dental Association supports routine visual and tactile oral cancer examinations for all patients during regular dental visits. Dentists follow a standardized protocol developed by the National Institute for Dental and Craniofacial Research, checking the soft tissues of the mouth, tongue, and visible parts of the throat for abnormalities. There’s no formal population-wide screening recommendation for head and neck cancer in asymptomatic adults, which makes these routine dental checks one of the few consistent opportunities for early detection.
Survival Rates by Stage
Outlook varies enormously depending on where the cancer started and how far it has spread at diagnosis. The American Cancer Society reports five-year relative survival rates (based on data from 2015 to 2021) that illustrate this range clearly.
For tongue cancer, the five-year survival rate is 88% when the cancer is still localized, meaning it hasn’t spread beyond the original site. That drops to 70% when it has reached nearby lymph nodes (regional spread) and 39% when it has spread to distant parts of the body. Floor-of-mouth cancers follow a steeper decline: 72% localized, 43% regional, 22% distant. Oropharyngeal cancers sit at 86% localized, 79% regional, and 40% distant, though these numbers don’t yet account for HPV status, which significantly improves the outlook for HPV-positive cases.
Globally, head and neck cancer incidence is rising, but mortality has been declining, largely because of improvements in treatment and earlier detection. One notable trend: the rate of increase has been faster among women than men in recent years.
How Treatment Works
Treatment for head and neck cancer usually involves some combination of surgery, radiation, and systemic therapy (drugs that work throughout the body). The specific plan depends on the cancer’s location, stage, and HPV status.
Early-stage cancers are often treated with surgery alone or radiation alone. More advanced cancers typically require a combination. For larger tumors or those that have spread to lymph nodes, a common approach is radiation given alongside drug therapy. In some cases, chemotherapy is given first (called induction chemotherapy) to shrink the tumor before the main course of treatment begins.
Immunotherapy has become an important part of treatment for cancers that have come back or spread. These drugs work by helping the immune system recognize and attack cancer cells. Several immunotherapy drugs are now FDA-approved for head and neck cancer, and they’ve changed the outlook for patients with recurrent or metastatic disease.
Targeted therapy, which blocks specific molecules that cancer cells need to grow, is another option. One widely used targeted drug works by blocking a growth signal on the surface of cancer cells.
Treatment for head and neck cancer can significantly affect daily functions like speaking, swallowing, and eating. Rehabilitation, including speech therapy and nutritional support, is a routine part of care. Dry mouth from radiation damage to salivary glands is one of the most common long-term side effects, and dental health requires close attention both during and after treatment.
Reducing Your Risk
The most impactful steps are avoiding tobacco in all forms and limiting alcohol. Because the combination of the two is so much more dangerous than either alone, eliminating even one meaningfully lowers risk.
HPV vaccination is a powerful preventive tool for oropharyngeal cancer. The vaccine is most effective when given before any exposure to HPV, which is why it’s recommended for preteens, but it’s approved for adults through age 45. Maintaining regular dental visits gives your dentist a chance to catch suspicious changes early, when treatment is most effective and least disruptive.