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There are a number of answers for breathing at a rapid rate.

Tachypnea is abnormally rapid breathing as used in general. The following others are also used.

In adult humans at rest, any respiratory rate between 12 and 20 breaths per minute is normal and tachypnea is indicated by a rate greater than 20 breaths per minute. Children have significantly higher resting ventilatory rates, which decline rapidly during the first three years of life and then steadily until around 18 years.

Some describe tachypnea as any rapid breathing. Hyperventilation is then described as increased ventilation of the alveoli (which can occur through increased rate or depth of breathing, or both) where there is a smaller rise in metabolic carbon dioxide relative to this increase in ventilation.

Hyperpnea, on the other hand, is defined as breathing more rapid and deep than breathing at rest.

Others give another classification: tachypnea is as any rapid breathing, hyperventilation is increased rate of breathing at rest, hyperpnea is an increase in breathing that is appropriately proportional to an increase in metabolic rate.

A third is: tachypnea is abnormally rapid respiration (though some may argue this is inaccurate as breathing differs from respiration), hyperventilation is increased rate or depth of respiration to abnormal levels causing decreased levels of blood carbon dioxide and hyperpnea is any increase in breathing rate or depth that is not normal.

Physiological causes of tachypnea include exercise. Among pathophysiological causes, tachypnea can be a symptom of sepsis, compensation for diabetic ketoacidosis or other metabolic acidosis, pneumonia, pleural effusion, carbon monoxide poisoning, pulmonary embolism, Asthma, COPD, laryngospasm, allergic reaction causing airway edema, foreign body aspiration, tracheobronchomalacia, congestive heart failure, anxiety states, or many other medical issues.

The word tachypnea uses combining forms of tachy- + -pnea, yielding "fast breathing".

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