Finding nasopharyngeal cancer early can make a big difference to the outcome, but because the nasopharynx sits deep behind the nose and is hard to see directly, this cancer often goes unnoticed until it reaches a more advanced stage. Understanding which symptoms should prompt you to see a doctor, and knowing what tests are available, can help you take action when it matters most.

Introduction: Who Should Undergo Diagnostics

Nasopharyngeal cancer is not always easy to recognize in its early stages. Many people with this condition don’t have any symptoms at first, or their symptoms are similar to other, less serious health problems. This makes it especially important to know when to seek medical advice and what diagnostic tests are available to detect this cancer.^[1][2]

You should consider seeing a doctor if you experience certain warning signs that don’t go away or keep coming back. The most common symptom is a painless lump on the back of your neck. This lump appears when the cancer has spread to the lymph nodes (small glands that are part of your immune system) in the neck, causing them to swell. Often, this neck lump is the first sign that brings people to their doctor, and in many cases, nasopharyngeal cancer is diagnosed only after the cancer has already reached these lymph nodes.^[2][3]

Other symptoms that should prompt you to seek medical evaluation include hearing problems, such as hearing loss in one ear, ringing in the ears (also called tinnitus), or a feeling of fullness in your ears. Ear infections that don’t go away with treatment can also be a warning sign. In adults, repeated ear infections are less common than in children, so if you have an ear infection without an upper respiratory infection, your doctor should examine your nasopharynx more closely.^[2]

Additional symptoms include a stuffy or blocked nose, usually on one side only, nosebleeds, headaches, blurred or double vision, facial pain or numbness, difficulty opening your mouth, difficulty swallowing, hoarseness, difficulty breathing or speaking, and unexplained weight loss. If you have any of these symptoms and they haven’t improved after three weeks, it’s very important to see your doctor. While it’s very unlikely that these symptoms are caused by nasopharyngeal cancer, it’s best to get them checked out.^[1][2][3]

People who are at higher risk for nasopharyngeal cancer may need to be more alert to symptoms. Risk factors include being of Southeast Asian or Chinese ancestry (particularly Cantonese), having a family history of nasopharyngeal cancer, being exposed to the Epstein-Barr virus (a very common virus that causes glandular fever), consuming a diet very high in salt-cured meats and fish, smoking, heavy alcohol use, and working with hardwood dust or a chemical called formaldehyde. If you have several of these risk factors and develop any of the symptoms mentioned above, it’s especially important to see your doctor promptly.^[3][4]

Diagnostic Methods

Initial Assessment by Your Doctor

When you visit your doctor with symptoms that might suggest nasopharyngeal cancer, the first step is usually a thorough discussion about your symptoms and a physical examination. Your doctor will ask about your health habits, past illnesses, and treatments. They will also examine your throat using a small mirror and a light, and feel your neck for any swelling in the lymph nodes. This initial examination helps the doctor decide whether you need to see a specialist for further testing.^[3][5]

If your family doctor suspects nasopharyngeal cancer, they will refer you to a head and neck cancer specialist, also called an oncologist. At the hospital, a number of different tests may be carried out to check for nasopharyngeal cancer and rule out other conditions.^[3]

Nasal Endoscopy

One of the most important tests for diagnosing nasopharyngeal cancer is called a nasal endoscopy or nasendoscopy. This procedure allows doctors to look inside your nasopharynx directly. During a nasal endoscopy, a thin, flexible tube with a tiny camera on the end, called an endoscope, is passed through your nose or through the opening in the back of your throat that leads up into your nasopharynx. You are usually conscious during this procedure, but local anesthetic can be used to numb your nose and throat so you don’t feel discomfort.^[3][13]

The endoscope lets your doctor see inside your nasopharynx and look for any abnormal areas that might be cancer. If the doctor sees something suspicious, they can take a sample of tissue during the same procedure for further testing.^[5]

Panendoscopy

Sometimes, a more detailed examination is needed. This is called a panendoscopy, and it’s carried out under general anesthetic, which means you’re unconscious during the procedure. The doctor uses a series of small, rigid telescopes connected together to examine your nose and throat in greater detail. This allows them to see more clearly and take tissue samples if needed.^[3]

Biopsy

A biopsy is a procedure to remove a sample of tissue so it can be examined under a microscope in a laboratory. This is the only way to confirm whether you have nasopharyngeal cancer. During a nasal endoscopy or panendoscopy, the doctor can use special tools passed through the endoscope to remove some tissue from any abnormal areas they see.^[3][13]

If there is swelling in the lymph nodes in your neck, the doctor might use a needle to draw out some cells for testing. This is called a needle biopsy. The tissue or cells are then sent to a laboratory, where a specialist called a pathologist examines them to check for signs of cancer.^[5][13]

In some cases, when someone comes to the doctor with swollen lymph nodes in the neck but no obvious source, finding Epstein-Barr virus genetic material in the tissue using a test called polymerase chain reaction (PCR) is strong evidence of a nasopharyngeal primary tumor, and the nasopharynx should be examined closely.^[4]

Imaging Scans

Once a diagnosis is confirmed, or sometimes to help make the diagnosis, doctors use imaging scans to look for tumors and check if the cancer has spread to other parts of the body. These scans create detailed pictures of the inside of your body and are painless procedures. The most commonly used scans for nasopharyngeal cancer include:^[3][13]

• MRI scan (Magnetic Resonance Imaging): This scan uses magnets and radio waves to create detailed images of soft tissues, including the nasopharynx and surrounding areas.
• CT scan (Computed Tomography): This scan uses X-rays and a computer to create cross-sectional images of your body. It can show the size and location of tumors.
• PET scan (Positron Emission Tomography) or PET-CT scan: This scan uses a small amount of radioactive material to show areas of high metabolic activity, which can indicate cancer. It’s often combined with a CT scan for more detailed information.
• X-ray: Sometimes, a simple X-ray may be used to look at certain areas.

These imaging tests help doctors determine the extent, or stage, of the cancer. Staging means giving the cancer a score to describe how large it is and how far it has spread. The stages of nasopharyngeal cancer range from 0 to 4. A lower number usually means a better outlook. Knowing the stage of the cancer helps doctors decide on the best treatment plan.^[13]

Neurological Examination

Because nasopharyngeal cancer can affect nearby nerves, your doctor may perform a neurological exam. This is a series of questions and tests to check your brain, spinal cord, and nerve function. The exam checks your mental status, coordination, ability to walk normally, and how well your muscles, senses, and reflexes work. This exam can help identify if the cancer is affecting nerves in your head and neck.^[5]

Blood Tests

While there isn’t a specific blood test that can diagnose nasopharyngeal cancer on its own, blood tests may be used as part of the diagnostic process or to monitor the disease. Some blood tests can detect genetic material from the Epstein-Barr virus, which is strongly associated with certain types of nasopharyngeal cancer. Elevated levels of Epstein-Barr virus in the blood can be a sign of nasopharyngeal cancer, especially in endemic areas.^[4]

Diagnostics for Clinical Trial Qualification

When patients are being considered for participation in clinical trials for nasopharyngeal cancer, they typically need to undergo a comprehensive set of diagnostic tests. These tests serve two main purposes: they help doctors confirm the diagnosis and stage of the cancer, and they establish a baseline of the patient’s health so that the effects of the treatment being tested can be measured accurately.^[14]

The standard diagnostic tests and procedures used for clinical trial enrollment usually include a thorough medical history and physical examination, including a neurological exam. Doctors need to understand the patient’s overall health status, past illnesses, and current symptoms.^[5][14]

A tissue biopsy is essential to confirm the diagnosis of nasopharyngeal cancer and to determine the type of cancer cells. The biopsy sample is examined by a pathologist to classify the cancer according to the World Health Organization’s classification system. This classification is important because different types of nasopharyngeal cancer may respond differently to treatments being studied in clinical trials.^[4]

Imaging scans are a crucial part of the qualification process for clinical trials. Patients typically need to have MRI scans, CT scans, or PET-CT scans to determine the exact size and location of the tumor and to check whether the cancer has spread to lymph nodes or other parts of the body. These scans help establish the stage of the cancer, which is often a key criterion for eligibility in clinical trials. Many trials are designed for specific stages of cancer, so accurate staging is essential.^[13][14]

Blood tests are also commonly required for clinical trial participation. These tests check the function of various organs, such as the liver and kidneys, and measure blood cell counts. They help ensure that the patient is healthy enough to participate in the trial and can tolerate the treatment being tested. Some trials may also require specific blood tests to detect Epstein-Barr virus DNA in the blood, as this can be a marker for nasopharyngeal cancer and may be used to monitor the disease during treatment.^[14]

Some clinical trials may require additional specialized tests depending on the type of treatment being studied. For example, if a trial is testing a treatment that targets a specific genetic mutation or protein, patients may need to have their tumor tissue tested for that mutation or protein before they can enroll. This type of testing is called companion diagnostic testing, and it helps identify which patients are most likely to benefit from the treatment being studied.^[14]

Follow-up testing during and after a clinical trial is also an important part of the process. Patients typically need to have regular imaging scans and blood tests to monitor how the cancer is responding to treatment and to check for any side effects. The schedule for these tests varies depending on the specific trial, but they are essential for collecting the data needed to determine whether the treatment being tested is safe and effective.^[14]