Tonsil Cancer: Symptoms, Causes, Stages, Diagnosis and Treatment 

Introduction

Have you noticed a persistent sore throat, trouble swallowing, ear pain, a lump in your neck, or changes around your tonsils, and wondered if it could be tonsil cancer^1,2? These symptoms may have many causes, but knowing the warning signs of cancer can help you understand when to seek medical advice. This blog explains tonsil cancer in simple terms, including its symptoms, causes, stages, and diagnosis. It also covers the available treatment options and what can be done to reduce the risk of tonsil cancer. 

What Is Tonsil Cancer?

The tonsils are small areas of lymphoid tissue found at the back of the throat that play a role in the body’s defence against infections. Tonsil cancer develops when cells in the tonsils start multiplying abnormally and continue to grow without control, eventually forming a cancerous tumour³.

Types of Tonsil Cancer

Tonsil cancer can develop from different types of cells found in or around the tonsils. The type of cancer depends on the cells in which the cancer starts. The common types of tonsil cancers include: 

• Squamous Cell Carcinoma (SCC): This is the most common type of tonsil cancer. It develops from the flat cells that cover the outer surface of the tonsils and nearby throat tissues. Depending on whether high-risk HPV is present, tonsil SCC can be classified as either HPV-positive or HPV-negative^1,3.
• Lymphoma: This is a less common cancer that can begin in the lymphoid tissue of the tonsils. Unlike SCC, it develops from immune-system cells called lymphocytes^3,4.
• Small-Cell Carcinoma: This is also known as small-cell neuroendocrine carcinoma (NEC) and is a rare but fast-growing type of cancer that develops in the tonsils⁵. It can spread quickly and is often harder to treat compared to other types¹. 

Stages of Tonsil Cancer

Tonsil cancer is staged as oropharyngeal cancer because the tonsils are located in the oropharynx. Doctors assess the tumour’s size, check whether nearby lymph nodes are involved, and look for any spread to distant parts of the body. The staging system also considers whether the cancer is HPV-related or HPV-negative, as this can affect the stage³. 

The Stages of HPV-Positive Tonsil/Oropharyngeal Cancer Are: 

• Stage I: 
  • Cancer may be found in one or more lymph nodes on one side of the neck, and it might be hard to identify the original tumour. The affected nodes are 6 cm or smaller. 
  • Cancer is found in the oropharyngeal area and it is 4 cm or smaller and may have spread to nearby lymph nodes on the same side of the neck. These nodes are also 6 cm or smaller. 

• Stage II: 
  • Cancer may be found in lymph nodes on one or both sides of the neck, but the original tumour may still be unknown. The affected nodes are 6 cm or smaller. (Or)
  • A tumour is found that is 4 cm or less. It may have spread to lymph nodes (6 cm or smaller) on the opposite side of the neck or both sides. (Or)
  • The tumour may be larger than 4 cm or may have reached the upper part of the epiglottis (the flap that covers the trachea to prevent the entry of food into it while swallowing). It may also have spread to lymph nodes that are 6 cm or smaller. 

• Stage III: 
  • The cancer may have grown into nearby areas, such as the voice box, jaw, roof of the mouth, or tongue muscles. It may have reached nearby lymph nodes. (Or)
  • Cancer may also have spread to one or more lymph nodes larger than 6 cm. 

• Stage IV: 
  • If tonsil cancer spreads to distant organs such as the bones or lung, it is called metastatic tonsil cancer. The cancer that has spread will still be the same type of cancer as the original. For example, cancer that spreads from the tonsils to the lungs is still tonsil cancer, not lung cancer. 

The Stages of HPV-Negative Tonsil/Oropharyngeal Cancer Are: 

• Stage 0 (carcinoma in situ): Abnormal cells are present in the lining of the oropharynx. These cells have not yet become cancer but may develop into cancer over time. 
• Stage I: The cancer might have formed, and the tumour is 2 cm or smaller. 
• Stage II: The tumour might have grown with a size of between 2-4 cm. 
• Stage III: The cancer may be larger than 4 cm or may have reached the upper part of the epiglottis. It may also have spread to one lymph node on the same side of the neck, which can be 3 cm or less. 
• Stage IV: Stage IV can be divided into IVA, IVB, and IVC: 
  • Stage IVA: Cancer might have grown into nearby structures such as the voice box, jaw, roof of the mouth or tongue muscles. It may also have spread to one lymph node of size 3-6 cm in the neck. 
  • Stage IVB: The cancer might have reached deeper structures of the head and neck, such as muscles or bones around the jaw, the skull base, or the area around the carotid arteries (large blood vessels in the neck that supply oxygen-rich blood to the brain). It may also involve lymph nodes larger than 6 cm or may have spread outside a lymph node into nearby tissues. 
  • Stage IVC: Cancer might have spread to distant organs, such as the lungs, liver, or bones⁶. 

Note: Tonsil cancer staging can vary based on HPV status and individual test results. Only an experienced doctor can confirm the exact stage and treatment plan. 

 Symptoms of Tonsil Cancer

The symptoms of tonsil cancer include: 

• Persistent sore throat that doesn’t improve 
• A painless lump on the neck 
• Pain inside the ear 
• Changes in voice 
• Unexplained pain (or difficulty) while swallowing food³
• A sensation of something stuck in the throat 
• Difficulty opening the mouth (trismus) 
• Unexplained weight loss¹ 

Note: Some people may have no symptoms, and the cancer may be noticed when one tonsil looks larger than the other. However, having one or two of these symptoms doesn’t mean that you have tonsil cancer. Any doubts should always be cleared by a qualified doctor. 

Causes of Tonsil Cancer

Tonsil cancer causes can vary between individuals. Some of the main causes include: 

• High-Risk HPV Infection: Certain HPV types, particularly HPV-16, can cause cellular changes that contribute to oropharyngeal cancer¹. 
• Tobacco Exposure: The chemicals in cigarettes and other tobacco products can damage the cells lining the throat over time. 
• Heavy Alcohol Use: Regular, high alcohol consumption can harm throat tissues and contribute to cancer development. People who consume alcohol and use tobacco together can further increase the risk².
• Cell Changes: Changes in certain genes can interfere with normal cell functions and may contribute to the development and progression of tonsil cancer⁷. 

Risk Factors for Tonsil Cancer

Certain factors can make a person more likely to develop tonsil cancer. The common risk factors of tonsil cancer include: 

• A history of smoking or tobacco use 
• Infection with HPV (particularly HPV-16) 
• Using tobacco-containing products or betel 
• A history of head and neck cancer⁶
• Being older (particularly male smokers) 
• Risky behaviours, like the use of intravenous drugs, might increase the chances¹ 

Note: Having one or two of these risk factors doesn’t necessarily cause tonsil cancer. People without any risk factors may also develop cancer. However, people with risk factors should always be cautious and try to reduce their risk. 

Also Read: Early Signs of Mouth Cancer You Should Know

Complications of Tonsil Cancer

It’s very important to identify the early warning signs of tonsil cancer to avoid its complications. The common complications of tonsil cancer include: 

• Advanced cancer spread to distant organs in the body¹.
• Obstruction of the airways 
• Skin of the neck becoming hard 
• Difficulty swallowing food 
• Difficulty in speaking, or sometimes even losing the ability to speak 
• Changes in the appearance of the face or neck⁸ 
• Nerve damage causing Horner syndrome (weakness of the nerves that control the shoulder, arm, and breathing muscles) 
• Life-threatening bleeding (if cancer grows around the carotid artery and weakens the blood vessel)¹¹ 

How Is Tonsil Cancer Diagnosed?

Several checks may be needed to find out whether a person has tonsil cancer, such as: 

• Taking Medical and Symptom History: The doctor might ask about symptoms such as a persistent sore throat, difficulty swallowing, ear pain, neck swelling, smoking or tobacco use, alcohol consumption, and how long the symptoms have been present^1,2,3.
• Clinical Examination: The doctor may carefully examine the mouth, throat and tonsil area for unusual swelling, sores, or growths. They may also check the neck for enlarged lymph nodes³. 
• Endoscopy: The doctor might do a naso-endoscopy (using a tube that has a light at its end) to get a closer view of the back of the throat. They may also do a panendoscopy (using an instrument with a tube and a camera at its end) to closely examine the inside of the throat. 
• Biopsy: If a suspicious area is found, the doctor removes a small tissue sample and sends it to a laboratory. This is called biopsy, which is needed to confirm tonsil cancer. The cells may also be checked for HPV¹.
• Imaging Tests: The doctor might recommend imaging tests such as computed tomography (CT), magnetic resonance imaging (MRI), or positron emission tomography (PET) to determine the size and location of the tumour and check whether the cancer has spread to nearby lymph nodes or other parts of the body¹.

Note: Depending on the findings, the doctor might recommend further tests to assess the patient’s overall health. 

Also Read: Throat Cancer: Symptoms, Causes, Diagnosis & Treatment

Treatment Options for Tonsil Cancer

Tonsil cancer treatment depends on factors such as the stage of cancer, tumour size, HPV status, overall health, and whether the cancer has spread. The most common treatment methods suggested by doctors include: 

• Surgery: The surgeon removes the cancerous tissue from the tonsil³ and, when necessary, nearby lymph nodes. 
• Radiation Therapy: In this treatment, high-energy radiation is directed at the cancer cells to destroy them or stop them from growing³. 
• Chemotherapy: This treatment uses medicines that destroy cancer cells or slow their growth. Cisplatin is one of the commonly used chemotherapy medicines for tonsil cancer^1,3. 
• Targeted Therapy: This treatment uses medicines that target specific features involved in cancer-cell growth. These include medicines like monoclonal antibodies. 
• Immunotherapy: A treatment that helps the immune system recognise and attack cancer cells. Examples of immunotherapies: Checkpoint inhibitors and cytokines³.

Note: Tonsil cancer can affect each person differently, so diagnosis and treatment should always be discussed with a qualified doctor. Not everyone will need all the treatments mentioned above. Depending on the individual condition, doctors may also combine different treatment approaches. 

Prevention of Tonsil Cancer

Although tonsil cancer cannot always be avoided, we can take certain measures to reduce its occurrence. Some of these measures include: 

• Avoid smoking and using other tobacco products. 
• Limit or avoid heavy alcohol consumption. 
• Use condoms and dental dams during sexual contact (to avoid HPV infection)⁹.
• Maintain good oral health and attend regular dental check-ups. 
• Pay attention to persistent changes in the mouth or throat rather than ignoring them. 
• Get HPV vaccination¹.

Note: Tonsil cancer cannot always be prevented, even when a person follows healthy habits. These measures may help reduce the risk, but they cannot guarantee that cancer will not occur. If you notice any persistent changes in your mouth or throat, speak with a qualified doctor for proper evaluation. 

When to Consult a Doctor?

Consult a doctor in case of a persistent sore throat, swallowing problems, a lump in the neck, unexplained ear pain, unusual changes around the tonsil, bleeding from the mouth or throat, lasting voice changes, or unexplained weight loss^1,2,3 Getting checked does not mean you have cancer. It simply helps determine whether further testing is needed and, if cancer is suspected or confirmed, can guide further diagnosis and treatment. 

Also Read: How to Prevent Cancer: Effective Ways to Reduce Your Cancer Risk

Conclusion

A sore throat or swollen tonsils may usually be caused by some common conditions like an infection. However, symptoms that last for several weeks should not be ignored. See a doctor if you have ongoing symptoms like throat pain or swallowing problems, a lump in the neck, unexplained ear pain, and unusual changes around the tonsils. Seeing a doctor can help you with proper diagnosis, and treatment for the exact cause of your symptoms. 

Frequently Asked Questions (FAQs)

References

1. Williamson AJ, Mullangi S, Gajra A. Tonsil Cancer. In: StatPearls. StatPearls Publishing; 2023. Accessed September 2, 2026. https://www.ncbi.nlm.nih.gov/books/NBK537238/

2. Head and neck cancers – NCI. 2021. Accessed September 2, 2026. https://www.cancer.gov/types/head-and-neck/head-neck-fact-sheet 

3. Tonsil cancer. Cancer Research UK. 2025. Accessed September 2, 2026. https://www.cancerresearchuk.org/about-cancer/head-neck-cancer/tonsil 

4. Lymphoma. MedlinePlus. 2024. Accessed September 2, 2026. https://medlineplus.gov/lymphoma.html 

5. Sen R, Bhutani N, Saini R, Jashanpreet. Primary small cell carcinoma of tonsil: An extreme rarity. Ann Med Surg (Lond). 2019;44:29-32. doi:10.1016/j.amsu.2019.06.010 https://pmc.ncbi.nlm.nih.gov/articles/PMC6598600/

6. Oropharyngeal cancer treatment. NCI. 2025. Accessed September 2, 2026. https://www.cancer.gov/types/head-and-neck/patient/adult/oropharyngeal-treatment-pdq 

7. Assessment of the mutation profile of tonsillar squamous cell carcinomas using targeted next-generation sequencing. PMC. Accessed September 2, 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC10045642/ 

8. Throat or larynx cancer. MedlinePlus. 2025. Accessed September 2, 2026. https://medlineplus.gov/ency/article/001042.htm 

9. HPV and oropharyngeal cancer. CDC. 2024. Accessed September 2, 2026. https://www.cdc.gov/cancer/hpv/oropharyngeal-cancer.html 

10. Oral cavity, oropharynx, hypopharynx, & larynx cancer prevention. NCI. 2025. Accessed September 2, 2026.  https://www.cancer.gov/types/head-and-neck/hp/oral-prevention-pdq

11. Is vaping harmful? Cancer Research UK. 2026. Accessed September 2, 2026. https://www.cancerresearchuk.org/about-cancer/causes-of-cancer/smoking-and-cancer/is-vaping-harmful 

12. Adil EA, Medina G, Cunningham MJ. Pediatric tonsil cancer: A national and institutional perspective. J Pediatr. 2018;197:255-261.e1. doi:10.1016/j.jpeds.2018.01.022 https://pubmed.ncbi.nlm.nih.gov/29571929/

13. Tonsil stones – symptoms, treatments and causes. healthdirect. 2024. Accessed September 2, 2026. https://www.healthdirect.gov.au/tonsil-stones 

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