You're exhausted. You're gaining weight. You can't think clearly. Something feels different in your body, but every time you have blood work done, you're told everything looks normal. Sound familiar? For many people, this is one of the most frustrating experiences in healthcare. You know how you feel, but the answers aren't showing up on your lab report.

Maybe you wake up tired even after a full night of sleep. You struggle to get through the afternoon without caffeine. Your workouts feel harder than they used to. Or perhaps you simply feel like your energy has disappeared. Feeling tired occasionally is part of being human. But persistent fatigue deserves attention, even when initial laboratory testing doesn’t reveal an obvious explanation.