Hyperventilation

[Vince]

Hyperventilation: Overbreathing. This can cause dizziness, lightheadedness, weakness, shortness of breath, a sense of unsteadiness, muscle spasms in the hands and feet, and tingling around the mouth and fingertips. All of these symptoms are the result of abnormally low levels of carbon dioxide in the blood caused by overbreathing [ Medicine Dictionary (2004 1)].
Hyperventilation is defined as a result from abnormal increase in the volume of breathing with an excessive amount of carbon dioxide being removed from the body [ Gleim & Gleim (2008 2)].
http://wikiofscience.wikidot.com/quasiscience:hyperventilation

 

[Vince]

I believe it can be caused by exercise, nausea or anxiety.

 

[CoastWatcher]

Stress, physical or psychological, can be a factor as well.