The normal range of respiratory rate for the elderly is 16 to 20 breaths per minute; respiration is too fast when it exceeds 24 breaths per minute, and too slow when it is less than 12 breaths per minute. 1. Normal respiration: there is no lung disease, and the ratio of respiratory rate to pulse rate in a quiet state is 1:4, i.e., normal respiration is once and pulse rate is 4 times. 2. Tachypnea: Tachypnea can be seen physiologically after exercise and pathologically in pneumonia, fever, hyperthyroidism, chronic obstructive pulmonary disease, bronchial asthma and so on. 3. Bradypnea: Bradypnea can be seen physiologically in deep sleep, and pathologically in shock, anesthesia overdose, increased intracranial pressure, low metabolism and other diseases. Whether it is fast breathing or slow breathing should be taken seriously, should be timely medical care, under the guidance of the doctor to rule out physiological abnormalities, and to find the causes of breathing abnormalities.