The document discusses 11 hidden causes of public speaking stress and provides 10 key principles to overcome public speaking fear. The hidden causes include thinking public speaking is inherently stressful, needing to be perfect, covering too many points, having the wrong purpose, trying to please everyone, and overpreparing. The key principles are that public speaking is not stressful, perfection is not required, focusing on 2-3 main points is sufficient, having the right purpose, considering yourself a contributor not speaker, humility and humor help, nothing bad can happen, not controlling the audience, less preparation is better, and the audience wants the speaker to succeed.