Laryngeal Cancer

Laryngeal cancer is a malignant tumor arising in the larynx – the organ in the throat commonly referred to as the voice box. The larynx plays a central role in three essential functions: phonation (producing voice), breathing, and swallowing. It is located at the top of the trachea (windpipe) and contains the vocal cords.

Laryngeal cancer is one of the more common head and neck cancers. The overwhelming majority of cases are squamous cell carcinomas, originating from the epithelial cells lining the inner surface of the larynx. It occurs significantly more often in men than in women, and is most frequently diagnosed in adults over the age of 55, with peak incidence in the 60s.

Because the larynx is so directly involved in the voice production, changes in voice quality – particularly persistent hoarseness – are often the earliest detectable sign of this cancer, particularly for tumors arising at the level of the vocal cords. When detected early, laryngeal cancer has a favorable prognosis and treatment can often preserve voice and swallowing function.

Laryngeal cancers are classified by their anatomical location within the larynx, which consists of three distinct regions:

Glottic cancer (vocal cord cancer)

• The most common type, accounting for approximately 60% of all laryngeal cancers. Glottic tumors arise at the level of the vocal cords (the true glottis). Because even small tumors at this location directly affect voice production, hoarseness tends to develop early – enabling earlier diagnosis and generally a more favorable prognosis compared to other laryngeal subsites.

Subglottic cancer

• The least common subtype, accounting for approximately 5% of cases. Arising below the vocal cords and extending toward the trachea, subglottic cancers may present late with breathing difficulties and are often advanced at diagnosis.

The symptoms of laryngeal cancer depend on the location and extent of the tumor. Because symptoms – particularly in their early stages – can resemble common throat conditions, they are sometimes initially attributed to infection or inflammation. Any symptom that persists for more than two to three weeks without improvement should be evaluated by a specialist.

Voice changes (hoarseness)

• Voice change is the most common and often earliest symptom, particularly in glottic cancer. Unexplained hoarseness or a persistent change in voice quality that does not resolve is the most important warning sign and warrants prompt laryngoscopic examination.

Persistent sore throat or throat discomfort

• A chronic sensation of irritation, pain, or the feeling that something is caught in the throat (globus sensation), which does not respond to standard treatment.

Difficulty swallowing (dysphagia)

• Swallowing pain or difficulty, which may be accompanied by the sensation that food is sticking in the throat is one of the symptoms. In advanced cases, pain may radiate to the ear on the same side as the tumor.

Chronic cough

• A persistent cough not attributable to respiratory infection or allergy.

Neck lump

• A palpable hard lump in the neck may indicate spread of the cancer to regional lymph nodes.

Coughing up blood (hemoptysis)

• Rupture of tumor blood vessels may produce blood-tinged sputum. This symptom always requires urgent evaluation.

Breathing difficulties

• As tumors enlarge, they may partially obstruct the airway, producing noisy, high-pitched breathing (stridor) or progressive shortness of breath.

Unexplained weight loss

• Significant unintentional weight loss may occur as the disease progresses.

The exact cause of laryngeal cancer – as with most malignancies – involves changes (mutations) in the DNA of laryngeal cells that allow for uncontrolled growth. Several well-established risk factors increase this likelihood.

Tobacco use

• Tobacco smoking is by far the most significant risk factor for laryngeal cancer. The risk is directly related to the duration and intensity of tobacco use. Cigarettes, cigars, and pipe tobacco all carry risk. Hookah (water pipe) smoking – which the World Health Organization has identified as delivering substantially higher levels of toxic compounds than conventional cigarettes – also increases risk. After quitting, the risk of laryngeal cancer decreases progressively over time.

Alcohol consumption

• Alcohol is an independent risk factor for laryngeal cancer. When combined with tobacco use, the two risk factors are synergistic – meaning the combined risk far exceeds the sum of either alone. The majority of laryngeal cancers occur in individuals who both smoke and drink heavily.

Human papillomavirus (HPV)

• Certain strains of HPV have been associated with laryngeal cancer. HPV-related laryngeal cancers are increasingly recognized, particularly among patients without a history of heavy tobacco or alcohol use.

Occupational and environmental exposures

• Prolonged exposure to certain substances in occupational settings has been associated with increased laryngeal cancer risk, including asbestos, nickel, wood dust, paint fumes, and chemicals used in metalworking, plastics, and textile industries. Appropriate workplace protective measures are recommended.

The following measures substantially reduce the risk of laryngeal cancer:

• Quit smoking: Smoking cessation is the single most effective preventive measure. Risk reduction is significant even after many years of tobacco use, and continues to decrease the longer a person remains smoke-free.
  
  
• Limit alcohol consumption: Avoiding heavy alcohol use, particularly in combination with tobacco, significantly lowers risk.
  
  
• Avoid passive (secondhand) smoke: While direct evidence linking passive smoking specifically to laryngeal cancer is limited, sidestream smoke contains higher concentrations of toxic substances than mainstream smoke and is generally considered harmful.
  
  
• Occupational protection: Use appropriate protective equipment when working in environments with exposure to known carcinogens (asbestos, wood dust, metalworking chemicals).
  
  
• Manage GERD: Appropriate treatment of chronic gastroesophageal reflux may reduce laryngeal mucosal irritation.
  
  
• Maintain a healthy diet: Adequate intake of vegetables, fruits, and whole grains, along with sufficient vitamins A, C, and E, supports mucosal health.
  
  
• Regular check-ups: Individuals with risk factors – particularly long-term smokers over age 55 – should seek prompt evaluation for any voice change or throat symptom that persists beyond two to three weeks.