Harwell's longtime friend and attorney, Gary Spicer, told the Detroit Free Press that Harwell was admitted last week with an obstruction in his bile duct. He returned to his home in suburban Detroit after doctors dislodged the obstruction, and he's under orders to rest for the next couple weeks.
"They had tests," the 91-year-old Harwell said Sunday, "and they're still trying to figure out what this is."
Harwell said he is not in pain or discomfort. Spicer told the Free Press he has canceled Harwell's public appearances for the next few weeks.
Harwell has stayed remarkably healthy over the years, something he credits in part to regular exercise all his life.
Harwell spent 55 seasons broadcasting in the Major Leagues, the last 42 of them in Detroit. He became known as the radio voice of the Tigers through generations of fans, from the 1968 team that won the World Series to the 1984 club that did the same. Harwell decided to retire following the 2002 season.
Since then, he has remained active, including as a spokesperson for Blue Cross Blue Shield of Michigan to encourage regular exercise. He still makes appearances at Comerica Park for occasional games, and he contributes regular segments for FSN Detroit on its "Tigers Weekly" program.
Jason Beck is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.