White tells the Chicago Tribune he found out in June after experiencing abdominal pain that he was born with one kidney. He decided to keep playing. But after suffering a kidney contusion in practice in the final days before the season opener, he ultimately opted to stop.
White appeared in all 12 games and made six starts as a freshman last season. He did not appear in any games this year.
White was approved as a medical non-counter by the Big Ten starting in the 2015-16 academic year, allowing him to remain on scholarship without counting against the team's limit of 85.
In a statement Thursday, White says he had to think about his long-term health.