GPN is believed to be caused by irritation of the ninth cranial nerve, called the glossopharyngeal nerve. Symptoms usually begin in people over age 50.

In most cases, the source of irritation is never found. Possible causes for this type of nerve pain (neuralgia) are:

• Blood vessels pressing on the glossopharyngeal nerve
• Growths at the base of the skull pressing on the glossopharyngeal nerve
• Tumors or infections of the throat and mouth pressing on the glossopharyngeal nerve

The pain usually occurs on one side of the head and may be jabbing. In rare cases, both sides are involved. Symptoms include severe pain in areas connected to the ninth cranial nerve:

• Back of the nose and throat (nasopharynx)
• Back of the tongue
• Ear
• Throat
• Tonsil area
• Voice box (larynx)

The pain occurs in episodes and may be severe. The episodes can occur many times each day and awaken the person from sleep. It can sometimes be triggered by:

• Chewing
• Coughing
• Laughing
• Speaking
• Swallowing
• Yawning
• Sneezing
• Cold beverages
• Touching (a blunt object to the tonsil of the affected side)

Tests will be done to identify problems, such as tumors, at the base of the skull. Tests may include:

• Blood tests to rule out any infection or tumor
• CT scan of the head
• MRI of the head
• X-rays of the head or neck

Sometimes the MRI may show swelling (inflammation) of the glossopharyngeal nerve.

To find out whether a blood vessel is pressing on the nerve, pictures of the brain arteries may be taken using:

• Magnetic resonance angiography (MRA)
• CT angiogram
• X-rays of the arteries with a dye (conventional angiography)

The goal of treatment is to control pain. The most effective medicines are antiseizure medicines such as carbamazepine. Antidepressants may help certain people.

In severe cases, when pain is difficult to treat, surgery to take pressure off the glossopharyngeal nerve may be needed. This is called microvascular decompression. The nerve can also be cut (rhizotomy). Both surgeries are effective. If a cause of the neuralgia is found, treatment should control the underlying problem.

How well you do depends on the cause of the problem and the effectiveness of the first treatment. Surgery is considered effective for people who do not benefit from medicines.

Complications of GPN may include:

• Slow pulse and fainting may occur when pain is severe
• Damage to the carotid artery or internal jugular vein due to injuries, such as a stab wound, that may be associated with GPN
• Difficulty in swallowing food and speaking
• Side effects of the medicines used

See your health care provider right away if you have symptoms of GPN.

See a pain specialist if the pain is severe, to be sure that you are aware of all your options for controlling pain.

Cranial mononeuropathy IX; Weisenberg syndrome; GPN

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Updated by: Joseph V. Campellone, MD, Department of Neurology, Cooper Medical School at Rowan University, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.