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American John Yettaw is shown in this 2005 photo released by his family. ((John Yettaw's family/Associated Press))

An American on trial for secretly entering the house of Burmese democracy leader Aung San Suu Kyi has been hospitalized after suffering seizures, hospital sources said Tuesday.

John Yettaw, 53, was admitted to Rangoon's main hospital Monday, but his condition is improving, according to the sources.

Yettaw faces up to five years in prison on charges he helped violate the terms of Suu Kyi's house arrest by swimming uninvited to her lakeside residence and staying two nights.

A court is to deliver a verdict next week in the case, which charges Suu Kyi with violating the terms of her detention. The 64-year-old Nobel Peace laureate could also be imprisoned for five years along with two companions who resided with her.

Yettaw, of Falcon, Mo., testified that he swam to Suu Kyi's house to warn her that he had had a vision that she would be assassinated.

He reportedly suffers from epilepsy, diabetes and other health problems, including post traumatic stress disorder from his time in the U.S. military.

His lawyer, Khin Maung Oo, said earlier that Yettaw had been kept in the hospital of Insein prison, so authorities could monitor his health.

 U.S. Embassy spokesman Richard Mei said that the embassy's consular officer, Colin Furst, visited Yettaw at the hospital Monday morning. He would not comment on Yettaw's condition.