U.S. former President Bill Clinton is recovering after two days of treatment for an infection in a California hospital, his doctors said on Thursday, Reuters reports.

The 75-year-old was admitted to the University of California Irvine Medical Center on Tuesday evening "for a non-COVID-19 infection," Clinton spokesman Angel Urena said on Twitter.

"He is on the mend, in good spirits, and incredibly thankful to the doctors, nurses and staff providing him with excellent care," Urena wrote. The spokesman added to Reuters: "He’s up and about, joking and charming the hospital staff."

Clinton went to the hospital after feeling fatigued and was diagnosed with an infection of the bloodstream that doctors believe started as a urinary tract infection, CNN reported, citing his doctors.

Clinton, a Democrat who was president from 1993-2001, has had past health issues, including a 2004 quadruple bypass surgery and a 2010 procedure to open a blocked artery in his heart with two stents. CNN reported that Clinton's current hospital stay is not related to his heart issues.

Clinton endured bruising political battles with Republicans. He was impeached in 1998 by the Republican-led House of Representatives over his sexual relationship with White House intern Monica Lewinsky but remained in office when the Senate acquitted him in 1999.