The scene on the during the second round of the U.S. Open at Chambers Bay after Jason Day collapsed from symptoms of vertigo.
Sports Illustrated/Robert Beck
By Brendan Mohler
Wednesday, July 08, 2015

The cause of Jason Day’s vertigo episodes at the U.S. Open at Chambers Bay has been discovered.

According to a Golf Channel report, Day has been diagnosed with a viral infection of an inner ear nerve. He is taking medication and is still expected to play the British Open at St. Andrews.

The Golf Channel report states that Day visited Dr. John Oas at Ohio State. Oas made the diagnosis after evaluating results from blood work and multiple sleep studies on the 27-year-old Australian.

The vestibular nerve, a part of the inner ear, is responsible for sending signals to the brain about head movement and body equilibrium. From Vestibular.org:

“Just as a courtroom judge must rule between two sides presenting competing evidence, the vestibular system serves as the tie-breaker between conflicting forms of sensory information. When the vestibular system malfunctions, it can no longer help resolve moments of sensory conflict, resulting in symptoms such as dizziness, vertigo and disequilibrium.”

Day has never finished better than T30 in the British Open and placed T60 in 2010 the last time it was held at St. Andrews. A few weeks ago at the U.S. Open, Day collapsed on the final hole of his second round (the par-3 ninth) but was able to complete the tournament. He played in the final group Sunday and finished T9, recording his fifth top-10 finish in the last 10 major championships.

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