Pancreatic cancer experts say they are puzzled by what is ailing Apple Chief Executive Steve Jobs, because it is not clear how serious his health problems are or how directly they relate to his bout with cancer.

Two weeks ago, Jobs said he had an easily treatable "hormonal imbalance" that was robbing his body of the proteins it needs. Then, last Wednesday, the 53-year-old CEO said his problems were "more complex" than originally thought, and he would take a medical leave of absence for six months.

Doctors who have not treated Jobs say they can only speculate without hard information, but they said the tumor he was treated for in 2004 could have spread to another organ or resurfaced in the pancreas, requiring surgery or other treatment.

Jobs could also be coping with side effects of that surgery that can be treated easily, they said.

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