Because she was planning to get pregnant, Janelle ... decided last year to go off powerful medication for stress-induced migraines in favor of a more fetus-friendly therapy. With sensors attached to her fingertips, neck, and abdomen, she spent 20 sessions learning to relax her muscles and slow her breathing and heart rate while watching a computer monitor for proof of the desired result. Eventually, she was able to do the work on her own. The migraine pain doesn't go away completely," says the 39-year-old from Bethesda, Md., who has remained off medication since her son's birth two months ago. "But it's been greatly reduced, and I'm able to deal with it better." Like meditation and yoga, the biofeedback method that Janelle now swears by is enjoying a sort of renaissance; while it's been around for some 40 years, a growing body of research has brought it to the mainstream, indicating that it can relieve some hard-to-manage conditions exacerbated by stress. Many major hospitals and clinics, including Harvard's Brigham and Women's Hospital and Duke University Medical Center, now offer biofeedback to people with hypertension and jaw pain as well as headaches, for example. Biofeedback's major appeal is that one series of sessions purportedly teaches a set of skills you can use for life"without side effects. And it's pre-emptive. "Biofeedback teaches you to identify early signs that stress is starting to get to you and to bring that stress reaction down before it causes physical symptoms," explains Frank Andrasik, a professor of psychology at the University of West Florida in Pensacola.