He suggested that a hyperactive thyroid or "adrenal insufficiency" -- types of hormone imbalances that can cause weight loss -- could be the problem.
John Marshall, chief of hematology and oncology at Georgetown University's Lombardi Comprehensive Cancer Center, also suggested "exocrine pancreatic insufficiency."
On the other hand, he said, "the return of the cancer could cause a hormone imbalance, too."
While Jobs's statement was welcomed by some analysts, some continue to believe that Jobs and the Apple board have a responsibility to divulge more about the health of the man considered to be one of the company's most critical assets.
"There's clearly an attempt here to be vague," Reiner said. "Whether it's intended to shield something that is material or simply to guard Steve Jobs' privacy is anybody's guess. They very clearly weighed these words very, very carefully."