When is keeping a secret bad for your health?

Not long after graduating from college, says Lacy Johnson, she was abducted by an ex-boyfriend and locked in a soundproofed basement room. After she escaped, she kept her life-threatening experience a secret, fearing what people might think. Now the author of a critically acclaimed autobiography, Johnson says it was writing that finally helped her overcome her trauma. New research by psychologist James Pennebaker documents the benefits of this kind of expressive writing. In this excerpt, America Tonight’s Michael Okwu explores just how unhealthy keeping secrets can be and when writing could help.