Tachypnea occurs as a result of an increased need for oxygen. If the lungs are not getting enough oxygen with each breath, the body increases the number of breaths to keep oxygen levels constant. Healthy people often experience tachypnea during and after exercise. The body needs more oxygen because of the increased exertion. Experiencing tachypnea at rest or with slight exertion is abnormal and can be a sign of an underlying medical issue.

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