When the heartbeat accelerates during stress, the sympathetic nerves become excited, the secretion of adrenaline increases, and the peripheral blood vessels constrict, which in turn raises the blood pressure.
Nervousness when the human heartbeat accelerates, at the same time there will be sympathetic nerve abnormal excitement, followed by an increase in adrenaline secretion, which will cause peripheral vasoconstriction, which leads to increased blood pressure. In addition, sympathetic nerve excitation will cause the heart rate to accelerate, myocardial contraction force will be enhanced, which will lead to the heart pumping more blood, will also cause an increase in blood pressure.
To summarize, when nervous heartbeat is accelerated blood pressure will also rise, this rise is generally transient, in daily life, try to maintain a balanced state of mind.