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Hyperventilation (a.k.a. overbreathing) occurs when the rate or tidal volume of breathing eliminates more carbon dioxide than the body can produce. This lowers the concentration of carbon dioxide dissolved in the blood leading to hypocapnia. The body normally attempts to compensate for this homeostatically but if this fails or is overridden, the blood pH will rise, leading to respiratory alkalosis. The symptoms of respiratory alkalosis include: dizziness, tingling in the lips, hands or feet, headache, weakness, fainting and seizures. In extreme cases it may cause carpopedal spasms, a flapping and contraction of the hands and feet.
Factors that may induce or sustain hyperventilation include: physiological stress, anxiety, high altitude, head injury, stroke, respiratory disorders such as asthma, pneumonia or hyperventilation syndrome, cardiovascular problems such as pulmonary embolisms, anemia, an incorrectly calibrated medical respirator and adverse reactions to certain drugs. Hyperventilation can also be induced intentionally to achieve an altered state of consciousness such as in the choking game, or in an attempt to extend a breath-hold dive.