The act of breathing has been central to life on Earth since the beginning, and the average human will take more than 600 million breaths in a single lifetime. But there’s a specific group of humans—a ...

Jenna Demmer is a writer and editor that specializes in health. She has covered many topics including infectious diseases, women's health, mental health, sleep, and more. She has written for more than ...

Jonathan Purtell, MS, RDN, CDN, is a registered dietitian at Lenox Hill Hospital. His primary interests include surgical and neurosurgical intensive care, orthopedic, obese/post-bariatric, and ...

Psychology Today's online self-tests are intended for informational purposes only and are not diagnostic tools. Psychology Today does not capture or store personally identifiable information, and your ...

If you have trouble breathing, your doctor may recommend a few tests to figure out what’s causing it. Some measure how much air you breathe in or out or how much oxygen is going from your lungs to the ...