Michael Douglas announced this week that a tumor has been discovered in his throat, and now outside doctors are warning that the aggressive treatment he'll undergo could alter, or even take away, his voice.

The 'Wall Street' star, 65, will undergo radiation and chemotherapy for eight weeks to destroy the tumor. "I am very optimistic," Douglas said in a statement. Other than that confirmation, little else is known about the star's condition, including the size of the tumor. Experts in the field say the actor faces a tough -- but winnable -- fight.