There are many reasons for high respiratory rate, the common ones are: 1, fever caused by various reasons. Fever can cause respiratory speed up, because fever will lead to the body’s energy consumption requires more oxygen, so through compensatory respiratory speed up to provide oxygen. 2, respiratory system diseases, such as acute attacks of chronic bronchitis, acute attacks of chronic pneumonia, chronic obstructive pulmonary emphysema, chronic pulmonary heart disease, bronchial asthma persistent state. 3, various reasons caused by cardiac insufficiency. Because cardiac insufficiency leads to a decrease in cardiac output, causing ischemia and hypoxia, it is necessary to reflexively accelerate breathing to obtain more oxygen. 4, physiological respiratory acceleration. For example, after strenuous activity or during pregnancy, the respiratory rate can be accelerated due to the need to consume more oxygen. 5. It is also seen when the respiratory rate is too high due to anxiety, tension and other psychological factors, and respiratory alkalosis is caused by hyperventilation. Clinically, blood tests, CT of both lungs, and examination of lung function can be performed to clarify the cause for timely treatment.