CBS-2 in Los Angeles reported that Wooden, 99, has not eaten for several days.
Wooden coached the Bruins to 10 NCAA championships in a 12-year period, including seven in a row beginning in 1967. UCLA ran off a streak of 88 straight victories under his guidance from 1971-1974.
He coached UCLA from 1948-1975, working with such stars as Kareem Abdul-Jabbar, Bill Walton, Keith Wilkes and Sidney Wicks.
His coaching career began in 1937 at Dayton High School in Kentucky.
Wooden became the first person to be elected to the Basketball Hall of Fame as both a player and coach. He won 620 games during his coaching career.