Throat Cancer

Throat cancer is a general term that applies to cancer that develops in the throat or voice box. The throat is a muscular tube that begins behind the nose and ends in the neck, while the voice box sits just below the throat and is also susceptible to throat cancer. Because the throat and voice box are involved in breathing, swallowing and speaking, cancers arising here can affect some of the body's most fundamental everyday functions, which is part of why early recognition and a clear understanding of the condition matter so much.

Throat cancer is not a single disease but a group of related cancers, classified according to the specific part of the throat or voice box in which they begin. Each type tends to behave somewhat differently, is linked to a slightly different set of risk factors, and can call for a different treatment approach.

Understanding the Throat and Voice Box

The throat, or pharynx, is a muscular tube roughly 12 to 13 centimetres long that carries air to the windpipe and lungs, and food and liquid to the oesophagus and stomach. It is generally divided into three regions: the nasopharynx at the top, behind the nose; the oropharynx in the middle, behind the mouth; and the hypopharynx at the bottom, just above the oesophagus and windpipe.

The voice box, or larynx, sits just below the throat, at the top of the windpipe. It houses the vocal cords, which vibrate to produce sound, and also contains a small flap of tissue called the epiglottis that closes over the windpipe during swallowing, preventing food and liquid from entering the lungs. Because of this central role in speech, breathing and safe swallowing, cancers of the larynx are considered separately from, though closely related to, cancers of the throat itself.

Types of Throat Cancer

Nasopharyngeal cancer: Cancer that begins in the nasopharynx, the part of the throat just behind the nose. It is closely associated with Epstein-Barr virus infection and, in Singapore and the wider region, occurs more frequently than in many Western countries.
Oropharyngeal cancer: Cancer that begins in the oropharynx, the part of the throat right behind the mouth that includes the tonsils and the base of the tongue. A growing proportion of these cancers are linked to infection with human papillomavirus (HPV).
Hypopharyngeal cancer: Cancer that begins in the hypopharynx, the lower part of the throat, just above the oesophagus and windpipe. It is strongly associated with heavy tobacco and alcohol use and is often diagnosed at a more advanced stage, as this region produces fewer early warning symptoms.
Glottic cancer: Cancer that begins in the vocal cords themselves. Because even small tumours here tend to affect the voice early, glottic cancer is often diagnosed relatively early compared with cancers elsewhere in the throat.
Supraglottic cancer: Cancer that begins in the upper portion of the voice box, above the vocal cords. This area has a rich network of lymphatic drainage, so supraglottic cancer has a higher tendency to spread to lymph nodes in the neck before it is detected.
Subglottic cancer: Cancer that begins in the lower portion of the voice box, below the vocal cords. This is the least common site for voice box cancer and can sometimes present with breathing difficulty if it narrows the airway.

Stages of Throat Cancer

Once throat cancer is diagnosed, doctors determine its stage to help guide treatment planning and provide a clearer picture of the likely course of the disease.

Stage I: A small tumor confined to its site of origin, with no spread to lymph nodes or distant organs.
Stage II: A somewhat larger tumor, or one that has grown into an adjacent part of the same region, but still without lymph node or distant spread.
Stage III: A larger tumor, or one that has spread to a single lymph node on the same side of the neck, without spread to distant organs.
Stage IV: Cancer that has grown into nearby structures such as the airway, thyroid or major blood vessels, spread to multiple or larger lymph nodes, or spread to distant organs such as the lungs.

Because different regions of the throat and voice box vary in how early they tend to produce noticeable symptoms, the stage at which throat cancer is first diagnosed can vary considerably depending on where it began — glottic cancers, for example, are often caught earlier because they affect the voice quickly, while hypopharyngeal cancers may not be detected until they are more advanced.

Symptoms of Throat Cancer

Signs and symptoms of throat cancer may include:

Coughing: A persistent cough that does not resolve over time, or that is not explained by a cold, allergy or other common cause, and may be a sign of ongoing irritation or a growth within the throat or voice box.
Changes in your voice: A hoarse, raspy, or otherwise altered voice that persists for more than a few weeks, which is often one of the earliest and most noticeable symptoms of cancer involving the vocal cords.
Difficulty swallowing: A sensation of food or liquid catching, or discomfort or pain when swallowing, which may start with solid foods and, if the condition progresses, extend to softer foods and liquids as well.
Ear pain: Pain felt in one or both ears without any apparent ear problem, which can occur because nerves in the throat and ear share overlapping pathways, so throat irritation can be felt as ear pain.
Lump or sore that doesn't heal: A lump felt in the neck or throat, or a mouth or throat sore that does not heal within the usual timeframe, which should always be assessed rather than assumed to be a minor injury or ulcer.
Sore throat: A sore throat that persists well beyond the typical duration of a cold or infection, or that does not respond to usual treatments.
Weight loss: Unintentional weight loss, often related to reduced food intake as swallowing becomes more difficult or uncomfortable.

Because many of these symptoms overlap with common, benign conditions such as colds, allergies or acid reflux, throat cancer is sometimes not suspected until symptoms have persisted for some time — which is why any of these signs lasting more than a few weeks are worth having assessed.

Risk Factors for Throat Cancer

Tobacco and alcohol use: Tobacco is the most important risk factor for head and neck cancers. Smokers have a much higher risk of these cancers than people who do not smoke, and the risk rises further with the number of years and amount smoked. Long-term exposure to secondhand smoke might also increase the risk of these cancers. Moderate or heavy alcohol use also increases the risk of these cancers, and the combination of heavy smoking and heavy drinking together raises the risk considerably more than either factor alone.
Viral infections, including Human papillomavirus (HPV) and Epstein-Barr virus: Infections with certain types of HPV can cause some forms of cancer, including cancers of the cervix, vulva, anus and throat — particularly the oropharynx, where HPV-related cancers have become increasingly common in recent years. Meanwhile, an Epstein-Barr virus (EBV) infection increases a person's risk of getting certain types of cancer, including nasopharyngeal and stomach cancer, and is a particularly significant factor in nasopharyngeal cancer rates seen in this region.
Gastroesophageal reflux disease (GERD): When acid from the stomach backs up into the oesophagus, it's called gastroesophageal reflux disease (GERD). This condition causes heartburn and increases the chance of oesophageal cancer, and the chronic irritation it causes to the lining of the throat is also thought to contribute to the risk of certain throat cancers over time.
Workplace exposure: Long-term exposure to wood dust, paint fumes and certain chemicals used in certain industries may increase your risk of throat cancer, reflecting the way repeated irritation and exposure to carcinogens in the workplace can, over years, contribute to cellular changes in the throat lining.

How Throat Cancer Affects the Body

Because the throat and voice box are so central to breathing, swallowing and speaking, throat cancer and its spread can have effects that extend well beyond the original tumour site.

Spread to lymph nodes: Throat cancers, particularly those of the oropharynx and supraglottic larynx, often spread first to lymph nodes in the neck, which is why a lump in the neck is sometimes the first noticeable sign, even before symptoms are felt in the throat itself.
Effect on breathing: As a tumour grows, it can progressively narrow the airway, causing breathing difficulty that may range from mild shortness of breath with exertion to a more urgent airway obstruction in advanced cases.
Effect on swallowing: Tumours affecting the throat or voice box can make swallowing increasingly difficult or unsafe, sometimes allowing food or liquid to enter the airway instead of the oesophagus, which increases the risk of choking or aspiration pneumonia.
Effect on speech and voice: Depending on which part of the voice box or throat is affected, cancer can cause anything from mild hoarseness to a complete loss of the ability to produce a normal voice.

How Is Throat Cancer Diagnosed?

Endoscopy / Laryngoscopy: The doctor may use an endoscope or laryngoscope — a thin, flexible or rigid tube with a light and camera — to get a closer look at the throat or voice box, directly visualising the area for suspicious growths or ulcers.
Biopsy: If abnormalities are found during the endoscopy or laryngoscopy, the doctor may collect a small tissue sample to be sent for testing under a microscope, which provides the definitive diagnosis and identifies the specific type of cancer.
HPV and EBV Testing: Tissue samples may also be tested for the presence of human papillomavirus or Epstein-Barr virus, since the presence of these viruses can influence prognosis and, in some cases, treatment planning.
Imaging Tests (CT, MRI or PET Scan): The doctor may perform a CT, MRI or PET scan to determine the extent of the cancer beyond the surface of the throat or voice box, including whether it has spread to lymph nodes in the neck or to distant organs.
Barium Swallow Study: Involves swallowing a contrast liquid while X-ray images are taken, which can help assess how well the throat is functioning and identify any narrowing or abnormality affecting swallowing.

Life After Treatment: Voice, Speech and Swallowing Rehabilitation

Because throat cancer treatment can significantly affect voice, speech and swallowing, rehabilitation is an essential part of recovery, particularly for patients who have undergone a laryngectomy or extensive surgery.

Voice restoration after laryngectomy: For patients who have had their voice box removed, several options exist to restore the ability to speak, including a small valve placed between the windpipe and oesophagus (tracheoesophageal puncture) that redirects air to produce voice, a hand-held electronic device (electrolarynx) that produces a mechanical-sounding voice, and oesophageal speech, a technique for producing sound without any device.
Speech and language therapy: A speech and language therapist plays a central role both before and after treatment, helping patients adapt to changes in speech, learn and practise voice restoration techniques, and address any swallowing difficulties that arise.
Swallowing rehabilitation: Many patients require support to relearn safe, effective swallowing after surgery or radiation, including specific exercises and, in some cases, temporary use of a feeding tube while healing takes place.
Stoma care: Patients with a laryngectomy stoma require education on cleaning and caring for the opening, humidifying the air they breathe, and recognising signs of a problem, all of which are typically taught by specialist nurses before discharge.

With appropriate rehabilitation, most patients are able to communicate effectively and eat safely again, though this often takes time, patience and close work with the care team, particularly after more extensive surgery.

Preventing Throat Cancer

There is no way to prevent throat cancer, but you can reduce your risk of throat cancer through the following measures:

Stop smoking or don't start smoking: You can work with your healthcare provider to find ways to quit smoking, such as with medication, nicotine replacement products and counselling. If you do not smoke, don't start. Quitting smoking, even after many years of use, meaningfully reduces the ongoing risk of developing throat and other head and neck cancers.
Drink alcohol in moderation: For healthy adults, drinking in moderation means up to one drink a day for women and up to two drinks a day for men. Reducing alcohol intake lowers the cumulative irritation and cellular damage to the lining of the throat over time.
Eat a healthy diet full of fruits and vegetables: The vitamins and antioxidants in fruits and vegetables may reduce your risk of throat cancer, likely by supporting the body's natural defences against cellular damage and inflammation.
Protect yourself from HPV: Some throat cancers may be caused by the human papillomavirus. Ask your doctor about the HPV vaccine, which may reduce your risk of throat cancer and other HPV-related cancers, and is most effective when given before exposure to the virus.

A throat cancer diagnosis often brings concerns that go beyond the cancer itself, given how closely the throat and voice box are tied to communication, eating and everyday social life. With modern, multidisciplinary treatment and dedicated rehabilitation support, however, many patients regain the ability to speak, eat and engage with life in a way that feels close to normal, even after significant treatment.

Understanding the specific type and stage of the cancer, the reasoning behind the recommended treatment plan, and the rehabilitation options available afterward helps patients approach diagnosis and treatment with clarity, and supports the best possible recovery of function and quality of life.