5 Warning Signs a Fibromyalgia Flare Living with fibromyalgia means constantly listening to your body, because flares rarely come out of nowhere. Sometimes the signs are subtle at first, a small shift in pain, sleep, or energy, but they’re your body’s quiet way of asking for extra care before symptoms intensify. 1. Headaches Flare You start getting more headaches than usual, or they feel stronger and harder to shake. Tension and migraines can be early signs your body is heading into a flare. 2.