Oral Cancer

Oral Cancer refers to malignant tumors that develop in the lips or inside the oral cavity – including the tongue, floor of the mouth, buccal mucosa (inner cheek lining), gums, hard palate, and retromolar trigone (the area behind the wisdom teeth).

Oral cancer is classified as a type of head and neck cancer. Squamous cell carcinoma accounts for more than 90% of all oral malignancies, arising from the flat epithelial cells that line the inside of the mouth. Less common types include salivary gland carcinomas arising from minor salivary glands, sarcomas developing from connective tissue, and rare forms such as malignant melanoma and lymphoma.

Oral cancer most commonly affects adults between the ages of 40 and 60, and occurs significantly more often in men than in women. While the oral cavity is one of the most accessible and visible areas of the body, the majority of oral cancers are not detected until an advanced stage – which directly impacts treatment outcomes and survival rates.

Oral Cancer is categorized by the specific location within the oral cavity where the tumor originates:

Tongue cancer

• Cancer arising on the lateral borders or undersurface of the oral tongue is the most common location for oral cavity malignancy. Lesions here are often initially mistaken for persistent mouth sores. 

Floor of mouth cancer

• Tumors developing in the soft tissue directly beneath the tongue tend to be aggressive and may invade nearby structures including the tongue, mandible (jawbone), and salivary gland ducts.

Buccal mucosa cancer

• Cancer of the inner cheek lining. This form is more prevalent in regions with high rates of betel nut chewing or smokeless tobacco use.

Gingival cancer (gum cancer)

• Malignant lesions on the upper or lower gum tissue may be confused with dental infections or periodontal disease. As the disease progresses, it may invade the underlying alveolar bone and cause tooth loosening.

Hard palate cancer

• Tumors on the bony roof of the mouth. These may include both squamous cell carcinomas and minor salivary gland tumors.

Lip cancer

• Most commonly affecting the lower lip, lip cancer is strongly associated with chronic sun exposure and tobacco use. It accounts for a notable proportion of oral cavity cancers overall.

Retromolar trigone cancer

• Located in the small triangular area behind the last molar, this area is anatomically close to the tonsils and oropharynx, and tumors here may spread rapidly to adjacent structures.

Early oral cancer may produce few or no symptoms, making routine dental and medical examinations particularly important. As the disease progresses, one or more of the following signs may appear:

• Non-healing sore or ulcer: A sore or wound in the mouth or on the lip that does not heal within two weeks is one of the most important warning signs of oral cancer.
  
  
• White or red patches (leukoplakia / erythroplakia): Flat white, gray, or red patches inside the mouth that cannot be scraped away. White patches (leukoplakia) are sometimes called "smoker's patches." Red patches (erythroplakia) carry a particularly high risk of malignant transformation and require immediate biopsy.
  
  
• Unexplained bleeding: Spontaneous or easy bleeding from a lesion or rough area inside the mouth.
  
  
• Lump or thickening: A palpable hard lump or thickened area in the cheek, gum, or tongue that does not resolve.
  
  
• Neck mass: As oral cancer spreads to regional lymph nodes, a lump may appear in the neck — sometimes before the primary tumor in the mouth is detected. Any neck mass that persists or enlarges should be evaluated promptly.
  
  
• Pain or numbness: Persistent pain, tenderness, or numbness in the mouth, tongue, lips, or jaw without an obvious cause.
  
  
• Difficulty chewing or swallowing (dysphagia): Advanced tumors may restrict jaw opening (trismus) or impair swallowing function.
  
  
• Voice changes: Hoarseness or a change in voice quality may develop as the tumor affects surrounding structures.
  
  
• Chronic sore throat: A persistent sore throat that does not improve with standard treatment.
  
  
• Loose teeth: Tumor invasion of the gingival tissue and underlying bone may cause teeth to loosen without an apparent dental cause.
  
  
• Persistent bad breath (halitosis): Tissue necrosis associated with ulcerated tumors can produce foul-smelling breath.

* Important: Not all of these symptoms indicate cancer. However, any symptom that persists for more than two weeks without improvement should be evaluated by a healthcare professional. Early detection significantly improves treatment outcomes.

The exact cause of oral cancer is not fully understood, but several well-established risk factors increase susceptibility:

Tobacco use

• Cigarette, cigar, and pipe smoking are the most significant risk factors for oral cancer. Smokers are approximately 7–10 times more likely to develop oral cancer than non-smokers. Smokeless tobacco products — including chewing tobacco, snuff, and betel nut — are also strongly associated with oral cavity cancers, particularly those affecting the buccal mucosa and floor of the mouth. Pipe smoking specifically increases the risk of lip cancer due to chronic irritation from the pipe stem.
  
  

Excessive alcohol consumption

• Alcohol is an independent risk factor and acts synergistically with tobacco. Individuals who both smoke and drink heavily face a substantially higher risk than those with either habit alone. Approximately 75% of people diagnosed with oral cancer have a history of tobacco use, heavy alcohol consumption, or both.
  
  

Human papillomavirus (HPV)

• HPV infection is a recognized cause of oropharyngeal cancer and plays a role in a subset of oral cavity cancers. HPV-related oral cancers are increasingly being diagnosed in younger patients without traditional risk factors.
  
  

Chronic sun exposure

• Prolonged ultraviolet (UV) radiation exposure is a specific risk factor for lip cancer, particularly cancer of the lower lip.
  
  

Poor oral hygiene and chronic irritation

• Chronic mechanical irritation from ill-fitting dentures, sharp tooth edges, or poor dental hygiene may contribute to mucosal changes that predispose to malignancy.
  
  

Pre-malignant oral lesions

• Conditions including leukoplakia, erythroplakia, oral submucous fibrosis, oral lichen planus, and syphilitic lesions are recognized as pre-malignant conditions. Tissue biopsy is required to determine the degree of dysplasia and cancer risk.
  
  

Nutritional deficiencies

• Deficiencies in vitamins (particularly B vitamins) and iron-deficiency anemia have been associated with an increased risk of oral mucosal changes and oral cancer.
  
  

Family history

• A family history of oral cancer or other head and neck cancers may confer a genetic predisposition, though this is less well characterized than for some other malignancies.
  
  

Age and sex

• Oral cancer is most common in adults aged 40–60 and is significantly more prevalent in men than in women. However, rates in younger adults and women have been rising, particularly in association with HPV.

While there is no guaranteed method to prevent oral cancer, the following measures substantially reduce risk:

• Quit tobacco use: Stopping all forms of tobacco — including cigarettes, cigars, pipes, chewing tobacco, and betel nut — is the single most important step in reducing oral cancer risk.
  
  
• Limit alcohol consumption: Reducing or eliminating alcohol intake lowers risk, particularly in combination with tobacco cessation.
  
  
• Protect lips from UV exposure: Use a lip balm with SPF protection when outdoors for extended periods.
  
  
• Maintain good oral hygiene: Regular brushing, flossing, and dental check-ups support oral health and allow for early detection of mucosal changes.
  
  
• Eat a balanced diet: Adequate intake of fruits, vegetables, and micronutrients supports immune function and mucosal health. Address vitamin deficiencies and iron-deficiency anemia.
  
  
• Regular dental examinations: Adults — especially those over age 40 who smoke or drink heavily — are encouraged to undergo oral cancer screening at least once a year. Dentists and oral health professionals are often the first to detect early mucosal changes.
  
  
• HPV vaccination: Vaccination against HPV may reduce the risk of HPV-related head and neck cancers, including a subset of oral cancers.