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!
Answer:
it's the adrenal gland
Explanation:
its because when you get stressed hormones related to that gland start a process initiated by the sympathetic nervous system when you encounter a serious/stressfilled situation, which cause the flight or fight response.