Concerns over Pope Francis' health have mounted in recent years as have questions about his succession. Here's what we know.

The Catholic world was thrown into uncertainty earlier this month when Pope Francis was taken to hospital with a respiratory tract infection. Over the following days, the 88-year-old pontiff’s infection spiralled into pneumonia in both lungs and kidney failure.

Pope Francis remains in “critical” condition at Rome’s Gemelli hospital. The 88-year-old, who has led the Catholic Church since 2013, is being treated for pneumonia in both lungs. Here is what we know about his health.

As Pope Francis remains in critical condition at Gemelli Hospital in Rome - still in charge of the Vatican and the worldwide Roman Catholic church - millions of the devout are praying for his full recovery,

Like his predecessors, Pope Francis was selected using an age-old method -- a system known as the Papal conclave.

Pope Francis is in a serious condition, as reported by the Vatican. Let's take a look at what has happened and the illness affecting the holy pontiff.

Pope Francis's recent health issues has sparked speculation about the future of his papacy. And, yes, folks are already betting on who will be next in line.