The situation where the blood pressure comes down after shaking hands may be due to measurement error and relaxation of muscles.
1. Measurement error: Blood pressure measurements need to be averaged three times because sphygmomanometers are subject to error. The inconsistency between the first and second measurements is not due to hand shaking.
2. Relaxation of muscles: Before measuring blood pressure, there will be muscle tension due to activities, shaking hands can subconsciously relax the muscles, but also can relieve the tension of the first measurement of blood pressure, so that the mood is stable, the blood pressure decreases, so that the measurement of the blood pressure value is lowered.
If high blood pressure should be timely consultation and formal treatment.