Dr. Sanjay Gupta on the mysteries of chronic pain

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.

Extended interview: Dr. Sanjay Gupta

In this web exclusive, Dr. Sanjay Gupta, a neurosurgeon and chief medical correspondent for CNN, talks with "Sunday Morning" host Jane Pauley about his new book, "It Doesn't Have to Hurt: Your Smart Guide to a Pain-Free Life." He discusses pain, which he calls "the most mysterious of all human…