Hyperventilation is rapid or deep breathing, usually caused by anxiety or panic. This overbreathing, as it is sometimes called, may actually leave you feeling breathless.
When you breathe, you inhale oxygen and exhale carbon dioxide. Excessive breathing may lead to low levels of carbon dioxide in your blood, which causes many of the symptoms that you may feel if you hyperventilate.
Rapid deep breathing; Breathing - rapid and deep; Overbreathing; F...
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