Uganda's veteran opposition leader Kizza Besigye has been admitted to the intensive care unit after collapsing in court while answering to treason charges, with his family saying he is unconscious and in critical condition.
The 70-year-old was taken to Mulago National Referral Hospital after he suddenly fell ill during proceedings at a Kampala court on Wednesday, cutting short the hearing and prompting emergency medical intervention.
His wife, Winnie Byanyima, announced the development in a post on X early Thursday, saying his condition remained grave.
"He is unconscious, unable to speak, and unresponsive even to a pain stimulus," said Byanyima, who also serves as Executive Director of the United Nations AIDS programme (UNAIDS).
Besigye was rushed from the courtroom in an ambulance moments after collapsing.
Government spokesperson Alan Kasujja did not immediately respond to requests for comment.
The opposition politician has remained behind bars since November 2024 after he and his aide, Obeid Lutale, were arrested in neighbouring Kenya before being taken back to Uganda, where both were later charged with treason.
His lawyers, supporters and human rights organisations have maintained that the charges are politically motivated, saying his detention forms part of a wider campaign against critics of President Yoweri Museveni's administration.
Museveni, 81, was declared the winner of Uganda's latest general election in January, but the outcome was rejected by his closest challenger, Bobi Wine, who later relocated to the United States.
Besigye's continued detention has attracted growing international attention, with rights groups repeatedly calling for his release.
For years, Besigye has remained one of the strongest political challengers to Museveni's long rule, although his journey from military officer to opposition leader is less familiar to many.
Born on April 22, 1956, Besigye is the second-born in a family of six. He trained as a medical doctor before later joining the military and politics.
He attended Kinyasano Primary School and Mbarara Junior School before completing his O-level studies at Kitante High School and his A-level education at Kigezi High School.
In 1975, he enrolled at Makerere University to study medicine and graduated five years later with a degree in human medicine.
He first worked at Mulago National Hospital before relocating to Kenya, where he practised at Aga Khan Hospital. He later also served at Kenyatta National Hospital.
Besigye joined President Museveni's National Resistance Movement and Army (NRM/A) in 1982 and became the rebel leader's personal physician.
Following the NRM/A's capture of power in January 1986, he was appointed Minister for Internal Affairs before later serving as Minister of State in the President's Office and National Political Commissar.
His military career continued to grow, with appointments as commanding officer of the mechanised regiment in Masaka in 1991 before becoming the army's chief of logistics and engineering two years later.
His relationship with the government later deteriorated after publishing a document in 1999 titled An Insider's View of How the NRM Lost the Broad Base, which criticised the ruling establishment.
He was court-martialled over the publication, although the charges were withdrawn in 2000 after he apologised.
Besigye retired from the Uganda People's Defence Forces in 2001 with the rank of colonel.
Later that year, he was briefly arrested over allegations of treason. In January 2025, a military court ruled that he could face trial for treachery.
Uganda's Supreme Court ruled on January 31, 2025, that civilians should not be tried before military courts, but that decision was not implemented.
Besigye began a hunger strike on February 11 before being admitted to hospital days later.
Bobi Wine, Byanyima and Besigye's lawyer have previously said his health had deteriorated, describing him as weak, dizzy and unwell.
The Commonwealth, together with several human rights organisations in Kenya, Uganda and Tanzania, has continued to push for his immediate release.