Former US President Joe Biden is undergoing treatment for metastatic cancer and has noticeably weakened as a result of the therapy, The Washington Post reports, citing sources close to the politician.

A year and a half after leaving the White House, the 83-year-old former president lives among a small circle of relatives, longtime friends, and former aides. According to the newspaper, treatment is working, but the illness and its consequences have noticeably affected his physical condition.

Biden's diagnosis of prostate cancer with bone metastases was announced in May 2025. That fall, it was reported that he had undergone radiation and hormonal therapy.

The publication's sources note that since leaving office, Biden has led a reclusive life: unlike some of his predecessors, he rarely appears in public, has not established a major charitable foundation or political organization, and has yet to raise funds for the construction of his presidential library. The former president's days, they say, are largely organized around his medical treatment, his family, and efforts to preserve his political legacy.

The Washington Post notes that questions about Biden's health could resurface in the fall, when his memoir is released, scheduled for November 17. The book is expected to reignite controversy surrounding his presidency and his decision to run for a second term. Concerns about Biden's physical and mental fitness were heightened after his June 2024 debate with Donald Trump, during which he spoke in a weak voice and faltered.