Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Take a deep breath in …and out. Feels good, right? And it's also necessary for staying alive. But what ...

Respiratory disorders may present with cough, sputum, wheeze or haemoptysis. Differentiation from cardiac disease (which may be concurrent) can be difficult since certain features are common to both.

Wesley Freppel does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...