Drinking hot water before taking a blood pressure test will not affect your blood pressure too much, so it will not cause a significant increase in blood pressure. If your blood pressure is high, you should look for other reasons, such as the presence of hypertension or high blood pressure due to stress. Before measuring blood pressure, it is recommended that you do not engage in strenuous exercise, do not drink coffee or strong tea, sit down or lie down and rest for 15-30 minutes before starting the measurement, and drinking hot water does not have a significant effect on blood pressure. If the measured blood pressure is high, it is necessary to look for the reason, it may be emotional tension leads to sympathetic nerve excitement, causing high blood pressure, you can rest or calm down your emotions and then measure again, or it may be that the blood pressure is really high, there is hypertension, need to go to the cardiology department of the hospital for further consultation and treatment.