How do you treat a disease where the cause is unknown and each patient’s symptoms are unique? CNN's Chief Medical Correspondent Dr. Sanjay Gupta talks to pain expert Dr. Carmen Green about what causes chronic pain, how it can be treated, and which patients are more likely to get care. Plus, meet a man who feels no pain and a woman who figured out how to cope with hers. This episode originally aired in November 2021.To learn more about how CNN protects listener privacy, visit cnn.com/privacy