【英语时差8,16】偏头痛-上（在线收听）

If you’ve ever had a migraine headache, you don’t need me to tell you it hurts. Doctors report that about twenty million people suffer from serious headaches, and ten percent of these have intractable pain–meaning it doesn’t go away. But here’s a surprise: the problem isn’t always a migraine. Sometimes very similar symptoms are caused by damage to a nerve of the face, which results in the nerve itself sending nonstop “ouch” signals. What can be done? A new treatment being tried out by a few doctors, including Dr. Robert Levy, a neurosurgeon at Northwestern Memorial Hospital, involves zapping with electricity certain nerves that innervate the face. It’s like a marathon in which thousands of runners are crossing the Brooklyn Bridge. Someone sends up a firework nearby and for a moment all the distracted runners stop and stare.