When she was 14 years old, Diana Chao began having migraines. She often felt dizzy as she walked. Sunlight seemed to pierce her skull.
“It felt like shards digging into my eyes,” said Chao, now 20 and a sophomore at Princeton University.
After a week of constant pain, her parents took her to an optometrist. That’s when they learned she was “swelling from the inside out,” Chao recalled.