Eagle Syndrome is a rare condition caused by an abnormality in the bony structures of the head and neck. Just below each ear sits a slender projection of bone called the styloid process, which in most adults measures roughly 2.5 centimetres. In individuals with Eagle Syndrome, this process is abnormally elongated - typically exceeding 3 centimetres - or the adjacent stylohyoid ligament, which normally remains flexible, has calcified and become rigid. Either variation can exert pressure on the surrounding nerves and blood vessels, producing the characteristic symptoms of the condition.

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The red arrows indicate LL3's elongated styloid processes (phot top left). A styloid process of normal length is circled in red (image lower left). Notice the clear difference in length.

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The most frequently reported symptom is persistent or intermittent pain localised to the throat, jaw, or ear, often described as sharp or shooting in character. Pain may radiate from the tonsil area toward the ear and tends to worsen with swallowing, turning the head, or opening the mouth wide. Some patients experience a dull, throbbing discomfort rather than acute pain. Symptoms typically affect only one side of the face, even when the structural abnormality is present bilaterally.

Eagle Syndrome is uncommon, occurring in an estimated 0.16% of the general modern population. In modern populations, women are approximately three times more likely to develop it than men. Many people have an elongated styloid process without ever experiencing symptoms, meaning the anatomical feature alone is not sufficient to produce the condition - nerve compression is the determining factor. [Content Credit: The Cleveland Clinic]​