Why does anxiety cause shortness of breath?

Anxiety. During an attack there is overflow of adrenaline which stimulates rapid breathing which can be perceived as shortness of breath, along with some narrowing of breathing passages.

Related Questions

Does depression and anxiety cause shortness of breath?

Yes, severe anxiety can cause shortness of breath. There are other possibilities, so if you are experiencing acute symptoms, please get evaluated by your doc. Read more...
Anxiety/ Panic. Panic attacks can often be accompanied by difficulty breathing, rapid breathing & chest tightness. People with anxiety often also complain of chest tightness and changes to breathing. Read more...