Tachypnea can be a sign of a serious problem. Sudden onset of tachypnea, tachypnea that does not resolve with the prescribed medication, or any difficulty breathing should be considered a medical emergency. This is especially true if the event occurs in conjunction with pain in the chest, arms, back, or jaw. These can be signs of a variety of problems including blood clots in the lungs, heart failure, pneumonia, or other serious lung conditions.

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