Dr. Sanjay Gupta on the mysteries of chronic pain

Jane Pauley talks with the author of "It Doesn't Have to Hurt" about the body's defenses against pain; and with Ed Mowery, whose decades-long experience with pain led to a revolutionary surgery and treatment.

Dr. Sanjay Gupta on the mysteries of chronic pain
Jane Pauley talks with the author of "It Doesn't Have to Hurt" about the body's defenses against pain; and with Ed Mowery, whose decades-long experience with pain led to a revolutionary surgery and treatment.

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