Patients with low blood pressure who drink alcohol will have two kinds of performance, a small amount of alcohol may increase blood pressure, this is mainly due to the excitatory effect of alcohol, because after drinking alcohol, the heart’s contractility will be enhanced, the frequency of contraction will be increased, these two performances will have the effect of elevating blood pressure. So low blood pressure patients drink a small amount of alcohol is able to raise blood pressure, but if excessive drinking, there will be a more serious low blood pressure, mainly due to a large number of drinking, the effect of alcohol on the expansion of blood vessels, far greater than the heart to increase the contraction force, frequency, so it will cause a large number of vascular expansion aggravated low blood pressure.