Barnes in hospital

Jimmy Barnes

Rocker Jimmy Barnes, who underwent open heart surgery earlier this year, is back in hospital after pushing himself too hard while still recovering.

Barnes, 51, had surgery in February to replace a faulty aortic valve, and has been re-admitted to a Sydney hospital with Dressler's syndrome, an inflammation of the sac around the heart. The singer, who is two shows into a national tour which began last week, faces further surgery if the inflammation doesn't go down.