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The reason anxiety causes shallow breathing is because anxiety is the activation of your fight or flight system. It's an evolutionary adaptation designed to keep you safe from harm. When faced with danger, your heartbeat speeds up and you breathe faster in order to get more oxygen for fighting or fleeing.
Shortness of breath has many causes affecting either the breathing passages and lungs or the heart or blood vessels. An average 150-pound (70 kilogram) adult will breathe at an average rate of 14 breaths per minute at rest. Excessively rapid breathing is referred to as hyperventilation. Shortness of breath is also referred to as dyspnea. Doctors will further classify dyspnea as either occurring at rest or being associated with activity, exertion, or exercise. They will also want to know if the dyspnea occurs gradually or all of a sudden. Each of these symptoms help to detect the precise cause of the shortness of breath.