High pressure mainly refers to systolic pressure, low pressure refers to diastolic pressure, and blood pressure 98/78mmhg does not belong to the range of normal blood pressure fluctuations. Blood pressure is mainly the blood flow process, the pressure caused by the side wall of the blood vessels; usually using mercury sphygmomanometer or electronic sphygmomanometer to monitor, and normal adults in a quiet state, the normal range of blood pressure is 100 ~ 120/80 ~ 89mmhg; therefore, blood pressure 98/78mmhg is not within the normal fluctuation range of blood pressure. However, blood pressure 98/78mmhg does not meet the diagnostic criteria for hypotension, which is <90/60mmhg, but is just on the low side; it may be due to physiological factors, such as a large amount of blood flow to the gastrointestinal tract to help digestion of food after a meal, which reduces blood supply to the heart and cerebral blood vessels resulting in the symptom of lowered blood pressure; usually there is no need to worry and no need to carry out special treatment. When abnormal symptoms appear during blood pressure monitoring, it is recommended to go to the hospital in time for early standardized treatment.