The development has attracted fresh attention both inside Uganda and across the region, with human rights groups calling for urgent action.
According to reports, Besigye's health worsened while he remained in detention, prompting doctors to move him to the ICU for specialized treatment.
His supporters have expressed fears about his condition and have continued to demand his immediate release so that he can receive proper medical care.
Following the reports, the UN called on the Ugandan government to respect human rights and ensure that every person in custody receives the medical attention they need.
The international body also reminded authorities that detainees should be treated with dignity and in line with international law.
President Yoweri Museveni's government has not publicly accepted claims that Besigye has been denied proper care.
Government officials have maintained that legal processes involving the opposition politician are being handled according to the law.
The latest development has sparked debate on social media, with many Ugandans and leaders from different countries sharing their views.
Some have urged the government to prioritize Besigye's health, while others insist that the legal process should continue without political interference.
Besigye has remained one of President Museveni's strongest political rivals for many years. He has contested the presidency several times and has often criticized the government's leadership and human rights record.
The UN's statement comes at a time when Uganda continues to face international scrutiny over governance, civil liberties, and the treatment of opposition figures.
Political observers say the way authorities respond to the concerns surrounding Besigye's health could influence Uganda's image on the global stage.
As the situation develops, many people are waiting for official updates on Besigye's condition and whether the government will respond to the UN's latest concerns.
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