Pope Leo XIV has been diagnosed with lung cancer after undergoing surgery to remove the affected portion of his right lung, placing the health of the leader of the world’s 1.4 billion Catholics under international scrutiny.
The 71-year-old pontiff underwent an operation at Rome’s Agostino Gemelli Hospital on Tuesday, October 13, 2026, after doctors discovered a suspicious growth in his lung during recent medical examinations.
The Vatican confirmed that laboratory examination of the removed tissue established that the Pope had pulmonary adenocarcinoma, a common form of lung cancer. The diagnosis confirmed suspicions raised by preliminary medical tests conducted before the operation.
Despite the alarming development, the Vatican reported that the surgery was successful and that no complications occurred during the procedure.
The Pope spent a calm first night in hospital following the operation, according to an update released by the Holy See Press Office on Wednesday. Further information on his recovery was expected as doctors continued monitoring his condition.
The development has drawn attention to the health of the American-born pontiff, who was elected leader of the Catholic Church in May 2025 following the death of Pope Francis in April of that year.
Surgeons remove lower lobe of Pope’s right lung
According to the medical report released by the Vatican, the operation involved removing the lower lobe of the Pope’s right lung using a video-assisted surgical technique.
The procedure itself lasted approximately 90 minutes, although the Pope spent about three hours in the operating room.
The surgical team was led by Professor Stefano Margaritora, a thoracic surgeon at Gemelli Hospital, alongside the Pope’s personal physician, Dr Luigi Carbone.
Doctors said the operation was intended to remove the affected tissue as thoroughly as possible. Following the procedure, the pontiff regained consciousness normally and was returned to his hospital room for observation.
The Vatican has not yet disclosed the tumour’s precise stage or whether cancer cells were found in nearby lymph nodes. Those findings are important in determining the extent of the disease and whether additional treatment will be necessary.
Medical specialists note that the outlook for lung cancer varies considerably depending on the type of tumour, its stage and whether it has spread beyond the original site.
Where the disease is confined to a small area and can be completely removed, surgery may offer a potentially curative option. More extensive disease can require additional treatment and may carry a less favourable prognosis.
Consequently, although the operation was reported to have gone well, the Pope’s longer-term outlook cannot be determined from the available information alone.
From an early warning to a confirmed diagnosis
The latest development follows the Pope’s own announcement on Sunday, October 11, when he disclosed that doctors had discovered a small, localised nodule in his lung during recent medical examinations.
Speaking to worshippers gathered in St Peter’s Square for the weekly Angelus prayer, Leo said the growth had been detected at an early stage and that his doctors had recommended surgery.
He explained that he had accepted their advice and would undergo the procedure in the following days.
At the time, the Vatican had not confirmed whether the growth was cancerous. The subsequent operation and examination of the removed tissue established the diagnosis.
The sequence of events has highlighted the importance of medical investigations when abnormalities are discovered, even when symptoms are limited or a patient otherwise appears to be in good health.
A lung nodule is a small area of abnormal tissue that may have several causes, including infection, inflammation or cancer. Its discovery alone does not establish a cancer diagnosis; further tests are required to determine its nature.
In the Pope’s case, the diagnosis was confirmed through examination of tissue removed during surgery.
Public engagements cancelled as Pope recovers
The Vatican has cancelled the Pope’s public audiences through October 20 to allow him time to recover.
He was expected to remain at Gemelli Hospital for approximately one week, although his discharge and subsequent schedule will depend on his recovery and medical advice.
The health setback has also cast uncertainty over his planned 11-day visit to Uruguay, Argentina and Peru from November 6 to 17.
As of October 14, the Vatican had not confirmed whether the South American journey would proceed as scheduled.
Such a visit would ordinarily involve demanding travel arrangements, public appearances, religious celebrations and meetings with political and Church leaders. Recovery from lung surgery may require a period of rest and rehabilitation before a patient can safely undertake extensive travel.
The Pope’s medical team will therefore play a central role in determining when he can resume his usual responsibilities.
The hospitalisation is a significant health development during the early years of his papacy, although the available information does not establish whether the cancer will have any lasting effect on his ability to lead the Church.
A global religious institution continues its work
The diagnosis has also renewed attention on how the Vatican manages its affairs when the Pope is temporarily unable to undertake his normal public duties.
As the supreme earthly authority of the Catholic Church, Leo occupies a position central to the governance of a global religious institution with approximately 1.4 billion faithful.
However, his hospitalisation does not automatically transfer the papal office or its authority to another individual. Vatican officials and senior Church leaders continue to perform their assigned responsibilities, while matters requiring the Pope’s personal approval may await his involvement.
On Wednesday, Filipino Cardinal Luis Antonio Tagle led a Mass in St Peter’s Square in place of the pontiff.
The celebration offered an example of how senior Church figures can maintain public religious activities during the Pope’s temporary absence, without implying that the papal office itself has changed hands.
The Vatican has not announced any transfer of papal authority.
Messages of support pour in
News of the diagnosis has prompted expressions of concern and support from public figures, reflecting the Pope’s international influence beyond the Catholic community.
United States Secretary of State Marco Rubio and his wife, Jeanette, said they were praying for the pontiff’s recovery. German President Frank-Walter Steinmeier also conveyed his wishes for a speedy and full recovery.
The messages have underscored the significance of the Pope’s health to Catholics and other communities around the world.
Leo, born Robert Francis Prevost in Chicago in 1955, spent decades serving as a priest, missionary and bishop, including extensive work in Peru, before his election to the papacy.
His leadership has placed him at the centre of religious diplomacy, international humanitarian concerns and debates affecting Catholic communities across continents.
The current medical challenge comes as he continues to establish his priorities and leadership style following his election in May 2025.
What happens next?
The immediate priority remains the Pope’s recovery and the further medical assessment of the tissue removed during surgery.
The Vatican has confirmed the diagnosis and the successful completion of the operation but has not provided enough information to establish the cancer’s stage, whether it has spread or whether further treatment will be required.
Those details will be crucial in understanding the seriousness of the condition and the likely timetable for his return to public duties.
For now, the cancellation of public engagements and the postponement of decisions about future travel reflect the need to give the pontiff time to recuperate.
The coming days are expected to provide a clearer picture of his progress as medical teams monitor his recovery.
For Catholics across the world, the news is a moment of concern for a spiritual leader whose responsibilities extend far beyond the Vatican.
For the Church itself, it is also a reminder that even its highest officeholder must confront the uncertainties of human health.
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