Oral Cavity Cancer: Causes, Symptoms, Diagnosis, Treatment and Prevention

Oral Cavity Cancer: Causes, Symptoms, Diagnosis, Treatment & Prevention 

Oral cavity cancer—commonly known as mouth cancer—is one of the most prevalent forms of head and neck malignancies worldwide. It affects the structures within the oral cavity, including the lips, tongue (front two-thirds), buccal mucosa (cheeks), gums, floor of the mouth, retromolar trigone, alveolar ridge, and hard palate. Oral cancer is both potentially life-threatening and highly preventable, provided risk factors are addressed early.

Despite advances in cancer treatment, many cases remain undiagnosed until the later stages, especially in regions where tobacco and alcohol use is common. This detailed article explores the epidemiology, causes, clinical features, diagnosis, management, and prevention of oral cavity cancer.

~Introduction to Oral Cavity Cancer

Oral cavity cancer primarily arises from the squamous cells that line the mouth, making oral squamous cell carcinoma (OSCC) the most common histologic type—accounting for nearly 90% of cases. Although it can occur at any age, it is most frequently diagnosed in adults over 50. However, lifestyle changes, including early initiation of tobacco habits, human papillomavirus (HPV) exposure, and betel nut chewing, have led to younger patients presenting with the disease.

This cancer threatens essential functions—speech, swallowing, chewing, taste, appearance, and quality of life—making early identification crucial.

~Epidemiology

Oral cavity cancer represents a significant health burden globally:

• It is one of the top 10 most common cancers in the world.

• Incidence is particularly high in South Asia, including India, Sri Lanka, Pakistan, Bangladesh, and parts of Southeast Asia—mainly because of tobacco, betel quid, and gutka consumption.

• Men are more frequently affected than women, though the gender gap is narrowing.

High-risk regions report an alarmingly high incidence among individuals aged 20–40 due to increasing use of smokeless tobacco products.

~Anatomy of the Oral Cavity

The oral cavity includes:

1. Lips

2. Buccal mucosa (inner cheeks)

3. Gingiva (gums)

4. Alveolar ridge

5. Hard palate

6. Retromolar trigone

7. Front two-thirds of the tongue (oral tongue)

8. Floor of the mouth

Understanding the anatomy helps identify how symptoms manifest and how cancer spreads.

~Risk Factors for Oral Cavity Cancer

1. Tobacco Use

The strongest and most well-established risk factor.

• Smoking cigarettes, cigars, or bidis

• Smokeless tobacco: gutka, khaini, zarda, paan, snuff

Tobacco contributes to nearly 80–90% of cases in high-incidence regions. Prolonged repeated exposure causes DNA mutations in oral mucosal cells.

2. Alcohol Consumption

Alcohol acts synergistically with tobacco, increasing cancer risk up to 30 times when combined.

3. Betel Nut / Areca Nut Chewing

Common in India and Southeast Asia.

• Leads to oral submucous fibrosis (OSMF), a precancerous condition.

• Arecoline (nut alkaloid) is directly carcinogenic.

4. HPV Infection

High-risk HPV strains, especially HPV-16, are increasingly linked to oral cancers—though more common in oropharyngeal cancers.

5. Poor Oral Hygiene

Chronic irritation, ill-fitting dentures, sharp teeth, and poor dental health contribute to long-term mucosal damage.

6. Diet

Low intake of fruits, vitamins A/C/E, and antioxidants disturb mucosal repair mechanisms.

7. Genetic Susceptibility

Family history, certain mutations (p53, p16), and impaired DNA repair pathways increase risk.

8. Occupational & Environmental Exposure

• Wood dust

• Asbestos

• Heavy metal exposure

• Sun exposure (lip cancer)

9. Immune Suppression

Patients with HIV or on long-term immunosuppressive therapy have higher susceptibility.

~Pre-Cancerous and Pre-Malignant Conditions

Certain lesions increase the risk of progression to oral cancer:

1. Leukoplakia

White patch that cannot be scraped off. Around 5–20% evolve into cancer.

2. Erythroplakia

Red patches—more dangerous than leukoplakia, with a high rate of malignant transformation.

3. Oral Submucous Fibrosis

A progressive fibrotic condition due to betel nut chewing. Carries up to 8–10% risk of cancer.

4. Lichen Planus

Chronic inflammatory condition; a small percentage can progress to OSCC.

Recognizing and treating these conditions early is important for prevention.

~Symptoms of Oral Cavity Cancer

Early Symptoms

Often silent initially but may include:

• Persistent non-healing ulcers lasting more than 2–3 weeks

• Red or white patches in the mouth

• Small lump or thickening in the mucosa

• Soreness or burning sensation

• Difficulty or pain while chewing

Advanced Symptoms

• Painful swallowing (odynophagia)

• Difficulty opening the mouth (trismus)

• Loose teeth

• Mass or growth in the tongue, floor of mouth, or cheek

• Bleeding from the mouth

• Swelling of the jaw or neck

• Ear pain (referred otalgia)

• Changes in speech or voice

• Dramatic weight loss

Any persistent oral lesion must be evaluated by a dental or ENT specialist.

~Diagnosis

1. Clinical Examination

Includes inspection, palpation, and evaluation of mobility, mucosal changes, and lymph nodes.

2. Biopsy

Gold standard.

• Incisional biopsy for large lesions.

• Excisional biopsy for small lesions.

3. Imaging Studies

Used for staging and treatment planning:

• CT scan – bone involvement

• MRI – soft tissue spread

• Ultrasound – lymph nodes

• PET-CT – metastasis detection

• X-ray (mandible/maxilla)

4. Other Diagnostic Tools

• Brush cytology

• Endoscopy for deeper evaluation

• HPV testing (when relevant)

• Blood tests for surgical readiness

~Staging of Oral Cavity Cancer (TNM System)

The American Joint Committee on Cancer (AJCC) uses:

• T (Tumor size and depth of invasion)

• N (Lymph node involvement)

• M (Distant metastasis)

Stage I–II

Small tumors, no nodes.

Stage III–IV

Large tumors, spread to lymph nodes, or distant sites (rare). Late-stage disease reduces the possibility of cure.

~Treatment Options

Treatment depends on the stage, tumor site, general health, and aesthetic/functional considerations.

1. Surgery

Primary modality for early and many advanced cases.

Types of surgical procedures:

• Wide local excision

• Partial or total glossectomy (tongue surgery)

• Mandibulectomy (jawbone removal)

• Maxillectomy

• Neck dissection (removal of lymph nodes)

Reconstruction may involve:

• Free flap surgery (fibula, forearm, thigh)

• Skin grafts

• Prosthetic devices

Surgery aims for clear margins while preserving speech and swallowing function.

2. Radiation Therapy

Used in:

• Early-stage cancers (curative intent)

• Post-surgical treatment (adjuvant radiotherapy)

• Advanced cases not suitable for surgery

• Palliative care

Modern techniques include IMRT to minimize damage to healthy tissues.

3. Chemotherapy

Commonly used drugs:

• Cisplatin

• 5-Fluorouracil

• Docetaxel

Indications:

• Combined with radiation (chemoradiation)

• Advanced or inoperable cancer

• Recurrences

4. Immunotherapy

Emerging and effective for advanced cases.

• Pembrolizumab

• Nivolumab

These help restore immune system recognition of cancer cells.

5. Targeted Therapy

Cetuximab targets EGFR-overexpressing tumors and may be used in certain cases.

~Complications of Treatment

Surgical Complications

• Speech impairment

• Difficulty swallowing

• Altered appearance

• Nerve damage

• Infection and bleeding

Radiation Side Effects

• Dry mouth (xerostomia)

• Mouth sores

• Loss of taste

• Tooth decay

• Jaw bone necrosis

Chemotherapy Side Effects

• Nausea, vomiting

• Hair loss

• Low immunity

• Fatigue

Psychosocial Impact

Oral cancer significantly affects patient self-esteem, mental health, and social functioning, requiring counseling support.

~Prognosis

Prognosis depends heavily on the stage at diagnosis:

• Early-stage cancers have a 5-year survival rate of 70–90%.

• Advanced cancers drop to about 20–40%.

• Nodal involvement significantly decreases survival.

Regular follow-up is essential to detect recurrence or second primary tumors.

~Prevention of Oral Cavity Cancer

1. Avoid Tobacco

Complete cessation is the single most effective preventive strategy.

2. Limit Alcohol

Moderation or abstinence reduces risk.

3. Avoid Betel Nut / Gutka

Especially critical in India and neighboring countries.

4. Improve Diet

Increase intake of fresh fruits, vegetables, antioxidants, omega-3 fatty acids.

5. Maintain Oral Hygiene

Regular brushing, flossing, and dental check-ups.

6. HPV Prevention

Vaccination against HPV may reduce risk for certain oral cancers.

7. Sun Protection for Lips

Use SPF lip balms.

8. Screening

High-risk individuals should undergo annual oral cancer screening by dentists or ENT specialists.

~Living with Oral Cavity Cancer

Rehabilitation Includes:

• Speech therapy

• Swallowing therapy

• Dental rehabilitation

• Nutritional support

• Psychological counseling

• Physical therapy after major reconstructive surgeries

Support groups and survivorship programs help patients regain confidence and adapt to life after treatment.

~Conclusion

Oral cavity cancer is a significant global health concern, especially in parts of Asia where tobacco and betel nut use is widespread. The majority of cases are preventable through lifestyle changes and early detection. Recognizing early symptoms—non-healing ulcers, red or white patches, persistent mouth pain—is essential. With advances in surgery, radiation, chemotherapy, and immunotherapy, survival outcomes are steadily improving.

The fight against oral cancer requires combined efforts—public awareness, early screening, lifestyle modifications, and access to timely medical care. Empowering individuals with knowledge is the first step toward reducing the burden of this potentially devastating disease.