In 2023 season, Tanoue developed inflammation in his right elbow in May and spent a two month in rehabilitation.[4] As a result, he never had a chance to pitch in the Pacific League.
On October 9, 2024, it was announced that Tanoue had been diagnosed with Langerhans cell histiocytosis, a disorder than affects 1 in 1 million adults. Despite fears he would never be able to pitch again, he faced three practice batters in a game the same day.[5]
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