A member asked:

What is happening in the respiratory system when it becomes hard to breathe?

A doctor has provided 1 answer

A whole book: Whole books are written about this. It can be mechanical like a collapsed lung, bronchospastic, like asthma, air-space replacement like heart failure, anemia, poison (like cyanide), infectious like pneumonia, blood clot and many, many more causes.

Answered 7/31/2014

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