'I am still alive', says Pope Francis as he leaves hospital

A jovial Pope Francis joked with well-wishers on Saturday as he left hospital after a three-night stay for bronchitis, and headed back to the Vatican to prepare for Christianity's most important week.

The 86-year-old pontiff, who was admitted to Rome's Gemelli hospital on Wednesday with breathing difficulties, got out of the car transporting him and smiled and joked with the crowd.

Asked by someone how he felt, he quipped twice with a big smile "I am still alive!"

Francis will now begin preparations for Holy Week and Easter, the most important week in the Christian calendar.

The pontiff felt unwell Wednesday after a general audience in St Peter's Square, but his condition improved after he was given antibiotics.