According to the Giants, the club had been monitoring Bochy since his physical on Wednesday due to his heart discomfort. On Friday, Bochy's son Brett told CSN Bay Area's Alex Pavlovic that Bochy was released from the hospital and was resting at home.
Bochy told the team that he plans to return on Sunday and will be "ready to go."
The Giants opened spring training in Scottsdale, Ariz., on Thursday with their first day of workouts. Bochy showed no signs of ill health during team activities, according to CSNBayArea.com.
Bochy, 59, is entering his ninth season as Giants manager. In his eight seasons so far, Bochy has gone 667-629, leading San Francisco to World Series titles in 2010, 2012 and 2014.
For his efforts last season, Bochy was named the recipient of the Sports Illustrated Coach of the Year award.
The Giants went 88-74 last season and went on to defeat the Kansas City Royals in a seven-game World Series.
- Ben Estes