Pope Francis, 88, is in critical condition due to double pneumonia and a severe lung infection. While receiving high oxygen flows and blood transfusions, doctors fear the onset of sepsis, which could further complicate his condition given his advanced age and respiratory issues.

Sunday's medical report warns that the Pontiff is suffering from mild renal insufficiency, and some experts suggest it could be a symptom of sepsis. Pope Francis continues to be hospitalized and his health condition is concerning.

Francis remains in critical condition but has not suffered any additional crises, the Vatican said Sunday evening, after reporting Saturday the pope suffered a “long asthmatic respiratory crisis” days after he was hospitalized for pneumonia.

Pope Francis was in critical condition Saturday after he suffered a long asthmatic respiratory crisis that required high flows of oxygen, the Vatican said.

The pope has begun working again after he showed slight improvement days after initially being listed in critical condition. Pope Francis is battling double pneumonia and is in the early stages of kidney “insufficiency,” The Associated Press reported.

ROME (AP) — Pope Francis remained in critical condition Monday but showed slight improvement in laboratory tests and resumed some work, the Vatican said, including calling a parish in Gaza City that he has kept in touch with since the war there began.