We devote vast resources to intensive, one-off procedures, while starving the kind of steady, intimate care that often helps people more.

By 2010, Bill Haynes had spent almost four decades under attack from the inside of his skull. He was fifty-seven years old, and he suffered from severe migraines that felt as if a drill were working behind his eyes, across his forehead, and down the back of his head and neck. They left him nauseated, causing him to vomit every half hour for up to eighteen hours. He’d spend a day and a half in bed, and then another day stumbling through sentences. The pain would gradually subside, but often not entirely. And after a few days a new attack would begin....

He saw all kinds of doctors—primary-care physicians, neurologists, psychiatrists—who told him what he already knew: he had chronic migraine headaches. And what little the doctors had to offer didn’t do him much good. Headaches rank among the most common reasons for doctor visits worldwide. A small number are due to secondary causes, such as a brain tumor, cerebral aneurysm, head injury, or infection. Most are tension headaches—diffuse, muscle-related head pain with a tightening, non-pulsating quality—that generally respond to analgesics, sleep, neck exercises, and time. Migraines afflict about ten per cent of people with headaches, but a much larger percentage of those who see doctors, because migraines are difficult to control.