What Is Oral Cancer?
Oral cancer is cancer that develops in the mouth or throat. It is more common than most people realize, but when caught early it is highly treatable. Here is what you need to know.
Definition
Oral cancer is an umbrella term for cancers that form in the oral cavity (lips, tongue, gums, cheeks, floor and roof of the mouth) or the oropharynx (tonsils, base of the tongue, and back of the throat).
Roughly 90% of oral cancers are squamous cell carcinomas — cancers that begin in the thin, flat cells lining these surfaces. Most start as a small, painless change that goes unnoticed until it has grown.
Types of oral cancer
Squamous cell carcinoma (SCC)
~90% of casesThe most common type by far. SCC begins in the squamous cells — the thin, flat cells that line the mouth, lips, tongue, and throat. Most oral cancers diagnosed are SCCs. Tobacco and alcohol are major drivers; HPV is increasingly implicated in oropharyngeal SCCs.
Oropharyngeal cancer
Tonsils, base of tongue, throatTechnically a subtype of SCC, oropharyngeal cancers develop at the back of the mouth and throat. They are now most commonly linked to HPV-16 infection rather than tobacco, and they tend to be caught at a later stage because the area is harder to see and symptoms are easy to miss.
Salivary gland cancer
Rare — <10% of casesCancer arising in the parotid, sublingual, or submandibular glands. There are several subtypes (mucoepidermoid carcinoma, adenoid cystic carcinoma, others), each with different behaviors and prognoses. Treatment and outlook vary widely by subtype.
Oral lymphoma
UncommonCancer of the lymphatic tissue in the mouth or throat. It is more likely to be seen in people who are immunocompromised (e.g., HIV-positive individuals). It typically presents as a soft swelling, often painless, in the tonsils or back of the mouth.
By the numbers
What causes it?
Oral cancer develops when cells in the mouth or throat accumulate DNA mutations that cause uncontrolled growth. Several well-established risk factors increase the likelihood of those mutations occurring.
Cigarettes, cigars, pipes, chewing tobacco, and snuff are the single biggest modifiable risk factor for traditional oral cancers (lips, tongue, floor of mouth). Risk is dose-dependent — heavier use means higher risk — and it falls significantly after quitting.
Heavy drinking is an independent risk factor, and the combination with tobacco multiplies risk rather than just adding it. People who both smoke heavily and drink heavily face a risk up to 15 times higher than non-users of either.
Human Papillomavirus, specifically HPV-16, has overtaken tobacco as the leading cause of oropharyngeal cancers. HPV-related cancers often appear in non-smokers in their 40s and 50s. The HPV vaccine dramatically reduces risk.
Chronic UV exposure is a leading risk factor specifically for cancer of the lower lip — not for cancers inside the mouth. People who work outdoors are at elevated risk. SPF lip balm and a wide-brimmed hat offer meaningful protection.
Risk increases with age. Most diagnoses occur after age 55, though HPV-related oropharyngeal cancers are increasingly common in middle-aged adults. Regular dental screenings become more important as you get older.
What does it look like?
Early oral cancer is often painless and easy to overlook. The most common signs include:
- →A red or white patch inside the mouth that doesn't go away
- →A sore or ulcer that hasn't healed in 2 weeks
- →A lump or thickening on the cheek, tongue, or gum
- →Unexplained numbness or pain in the mouth or face
- →Difficulty chewing, swallowing, or moving the jaw
- →Hoarseness or a sore throat lasting more than 2 weeks
- →A painless lump in the neck
See the full warning signs guide for detailed descriptions and photos.
The 2-week rule
Any sore, patch, lump, or change in your mouth that has not healed or resolved after 2 weeks should be evaluated by a dentist or doctor. Most of the time it turns out to be nothing serious — but catching oral cancer early changes everything.
Common questions
What is oral cancer?+
Oral cancer is cancer that develops in any part of the mouth (oral cavity) or the back of the throat (oropharynx). This includes the lips, tongue, gums, floor of the mouth, hard and soft palate, cheeks, and throat. Most oral cancers are squamous cell carcinomas — cancers that begin in the flat cells lining these surfaces.
What are the types of oral cancer?+
The main types are: squamous cell carcinoma (about 90% of cases), oropharyngeal cancer (tonsils, base of tongue, throat — often HPV-related), salivary gland cancer (rare, with several subtypes), and oral lymphoma (uncommon, more likely in immunocompromised individuals).
Is oral cancer the same as throat cancer?+
They overlap. Oral cancer typically refers to cancers of the lips, tongue, gums, cheeks, and floor and roof of the mouth. Oropharyngeal (throat) cancer affects the tonsils, base of the tongue, and back of the throat. Because these regions connect, they are often grouped together as 'oral and oropharyngeal cancer.'
How common is oral cancer?+
More than 54,000 Americans are diagnosed with oral and oropharyngeal cancer each year. It is about twice as common in men as in women, and the median age at diagnosis is 62. It ranks among the ten most common cancers worldwide.
Can oral cancer be cured if caught early?+
Yes. The 5-year survival rate for early-stage oral cancer is around 84%. At a late stage, that drops to roughly 40%. Early detection through routine dental checkups and monthly self-exams is the single biggest factor in improving outcomes.