Tiger Woods' injury timeline

— -- Tiger Woods' ailments are well documented throughout his career, starting in his collegiate days and continuing throughout his nearly 20 years on the PGA Tour.

The following graphic is a list of Woods' surgeries prior to Friday's announcement of his second microdiscectomy operation.

1994: Tumor removal. When Woods was a student at Stanford University, he had a benign tumor removed from his left knee.

2002: Cyst removal, fluid drain. In December 2002, Woods had a benign cyst removed from his left knee and fluid drained from around one of his ligaments. He returned to play at the 2003 Buick Invitational, which he won.

2006: Shoulder. After winning the World Golf Championships-Bridgestone Invitational and the Deutsche Bank Championship in back-to-back weeks, Woods was unsure whether he would be able to play in the World Golf Championships-American Express Championship because of an injured muscle in his left shoulder blade. He did, in fact, play the event, winning with a total of 23 under.

2007: Ruptured ACL. Woods ruptured the anterior cruciate ligament in his left knee while at home running after the 2007 British Open but decided against surgery. He then went on to win five of his next six events.

2008: Arthroscopic knee surgery. Two days after finishing second at the 2008 Masters, Woods had arthroscopic knee surgery to clean out cartilage. He was set to recover in four to six weeks. He made his return to the course at the U.S. Open. The result? He won.

2008: ACL repair. Woods has reconstructive surgery on the damaged ACL and missed the remainder of the 2008 season. In addition to the ACL problem, Woods also has a double stress fracture in his left tibia as a result of preparations for the 2008 U.S. Open.

2008-09: Torn right Achilles tendon. At the 2010 Masters, Woods revealed that he tore his right Achilles tendon in 2008, and reinjured the tendon several times in 2009, yet continued to play.

2010: Apparent neck injury. Woods is forced to withdraw from the Players Championship during the final round with a neck injury. An MRI reveals that Woods has an inflamed facet joint in his neck.

April 26, 2011: Left MCL sprain, strained left Achilles tendon. Tiger Woods announces he will miss the Wells Fargo Championship in North Carolina. Woods suffered a Grade 1 mild MCL sprain to his left knee and a mild strain to his left Achilles tendon while hitting a difficult and awkward second shot from the pine straw under the Eisenhower tree left of the fairway at No. 17 during the third round of the Masters. Woods was able to continue playing at Augusta and then later decided to seek a medical evaluation.

May 12, 2011: Knee, Achilles act up. Woods withdraws from The Players Championship with apparent injuries after nine holes (shot 42). "The knee acted up, and then the Achilles followed after that, and then the calf started cramping up. Everything started getting tight," he said. Woods didn't play again until WGC-Bridgestone Invitational in August 2011.

March 11, 2012: Injury to left Achilles tendon. Woods withdraws from final round of WGC-Cadillac Championship.

March 2, 2014: Back issues. Woods withdraws from the final round of The Honda Classic.

March 18, 2014: Back spasms. Woods announces he won't play Arnold Palmer Invitational, citing lingering pain.

April 1, 2014: Back surgery. Woods announces he will miss the Masters after undergoing a procedure, called a microdiscectomy, for a pinched nerve, which has been hurting him for several months. Woods said he will return to golf "sometime this summer," which he did in late June at the Quicken Loans National

Sept. 16, 2015: Back surgery. After missing the cut in three of the four majors of 2015 but posting his best finish of the year in his final start, in August, Woods underwent a second microdiscectomy surgery and hopes to return in "early 2016."