Coffee will have an effect on blood pressure, if you drink coffee will cause a mild increase in blood pressure in a short period of time, especially for people who are heavier blood pressure will rise more significantly. Long-term coffee drinkers will have higher blood pressure than non-coffee drinkers, because coffee contains caffeine, which can excite the sympathetic nerve and cause blood pressure to rise. In addition, when drinking coffee, it is recommended not to add sugar, milk, in order to avoid increasing weight and aggravating the high blood pressure. There are four other things to note when drinking coffee: 1, do not smoke at the same time when drinking coffee, smoking will make the brain highly excited, caffeine in the role of nicotine, which may lead to cell cancer. 2, do not drink coffee when taking drugs. 3, children do not drink coffee. 4, lactating women and pregnant women can not drink coffee.