Top New York internist Dr. Stuart Fischer, who has not treated Teri, told The ENQUIRER the star’s own immune system is attacking the sheathing on her nerves. “There’s no known cause and no known cure, and the disease is unfortunately irreversible,” he said. Medication, however, can slow the march of MS. Thanks to these drugs, Teri — seen here in 2014 with Mel Brooks
and Cloris Leachman
— is proving she is tougher than she looks!