Although we need to breathe to stay alive it is possible to breathe too much.
When you breathe too much it's called excessive breathing and when you're breathing too much the excessive breathing creates a low level of carbon dioxide in your blood.
That low level of carbon dioxide in your blood is not a good thing because it causes hyperventilation.
Hyperventilation can be caused by a panic attack, severe anxiety or a medical problem, such as bleeding or infection.
Usually nothing serious happens when you're hyperventilating and breathing into a paper bag can help with the hyperventilation.
However if you think something more serious is going on then call 911 just to be safe.