Overbreathing due to stress, anxiety,depression, panic can cause this.You may not know it. You blow out too much carbondioxyte (CO2). To correct it close your mouth and one of your nostril and breathe to increase the CO2 of the blood. To read more please click the link just below:
http://www.nlm.nih.gov/medlineplus/ency/article/003071.htm
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