Question

What causes shortness of breath for days?

Answer 1

a lot of things can cause a shortness of breath for example asthma lung cancer and muscle knots and that's just stuff off the top of my head

Answer 2

Many things can cause shortness of breath, but the most common are asthma, pneumonia, bronchitis, lung cancer, anxiety, an allergic reaction, a lung injury, obesity, heart dysfunction, COPD and many many more things.

As for treating this, see your physician. Hope I helped you!