Normal adult respiratory rate at rest is 12-20 breaths/minute, and neonatal respiration is around 40 breaths/minute, slowing down with age. Adults generally breathe 12-20 times per minute at rest, with a slight increase in respiratory rate after exercise. If the respiratory rate exceeds 24 breaths/minute, it is considered tachypnea, which is commonly associated with fever, pain, and hyperthyroidism; if the respiratory rate is less than 12 breaths/minute, it is considered bradypnea, which is commonly associated with overdose of sedatives and increased intracranial pressure. As the respiratory system is not yet well developed, the respiratory rate of newborns is higher, and the respiratory rate is usually around 40 breaths/minute, and with age, the respiratory rate will gradually decrease to the adult range. Respiratory rate is one of the vital signs, and heart, lung, and neurological diseases can all be manifested by abnormal respiratory rate. If abnormal breathing occurs, it is recommended to consult a doctor promptly to identify the cause of the disease and treat it aggressively.