Former US president Bill Clinton has been admitted to a hospital in California and is reportedly being treated for a suspected case of sepsis.
Mr Clinton's spokesman said the ex-president is "on the mend" and "in good spirits" as he receives treatment at the University of California Irvine Medical Center.
The spokesman, Angel Urena, said Mr Clinton, 75, was admitted for a non-Covid related infection.
The US TV network CNN reported that he went to the hospital feeling fatigued and was diagnosed with a suspected blood infection, or sepsis, that doctors believe started as a urinary tract infection.
Sepsis is a life-threatening condition where the immune system overreacts to an infection and begins to damage the body's tissues and organs.
Mr Clinton was admitted to Irvine earlier this week.
His spokesman, Mr Urena, said in a statement: "On Tuesday evening former president Bill Clinton was admitted to UCI Medical center for treatment of a non-Covid infection.
"He is on the mend, in good spirits, and incredibly thankful to the doctors, nurses and staff providing him with excellent care."
CNN reported that Clinton was in the intensive care unit, primarily to give him privacy.
He was not on a breathing machine, according to doctors treating the former president at University of California Irvine Medical Center, California.
His condition is not related to his previous heart problems or Covid-19, CNN said.
Mr Clinton is expected to be released from the hospital soon.
The former president's physicians, Alpesh Amin and Lisa Bardack, said he was "admitted to the hospital for close monitoring and administered IV antibiotics and fluids".
"He remains at the hospital for continuous monitoring," they said in a statement.
"After two days of treatment, his white blood cell count is trending down and he is responding to antibiotics well."
They added: "We hope to have him go home soon."
Mr Clinton has had a number of health issues over the years, 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.
The former Arkansas governor served two terms as US president from January 1993 and January 2001, and his wife Hillary made a failed bid to become the first American president in 2016, when she lost the election to Donald Trump.
Mr Clinton 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.
