According to experts at the Institute for Studies Mr Brown is showing clear signs of the illness includingtension, anxiety and an insatiable desire to continually blame everything on Americans.
Professor Henry Brubaker said: "He has character traits that make him particularly prone to becoming recessed.
"These include chronic introversion and an underlying paranoia, as well as using billions of pounds of other people's money to buy votes and spending 10 years telling bankers they could do whatever the fuck they wanted to."
The professor said the symptoms can become so acute that the patient sees or hears things that are not there, such as economic recovery by the fourth quarter of 2009.
And he claimed the prime minister's condition had now reached the stage where other people could become recessed simply by listening to his voice or looking at his face.
Professor Brubaker added: "I became particularly concerned last week when the prime minister flew to Egypt, took all his clothes off, jumped into the Nile and stood there waist deep in the water before announcing to a group of puzzled farmers that he was not in the Nile."
"I turned to my wife and said, 'you know what Elsie, whether he likes it or not, that is a man who is clearly in the Nile'."