The maximum value of blood pressure is usually between 90-140 mmhg for normal people and the minimum value is usually between 60-90 mmhg. Blood pressure that is outside the normal range of either the highest or lowest value can be harmful to human health. The above normal values are only for adults without underlying diseases. For some elderly people, the values may be slightly higher than the above normal values, because the blood vessels of the elderly will gradually harden as their body functions deteriorate, which will cause an increase in blood pressure. For some patients with underlying diseases, such as diabetes and coronary heart disease, the high and low values of blood pressure will also be abnormal. For these people, we should actively treat the primary disease, and at the same time, we should take antihypertensive drugs, such as nifedipine delayed-release tablets on a regular basis, so as to keep the blood pressure in the normal range and avoid serious consequences. The maintenance of normal blood pressure requires patients to develop good habits of work and rest, do not stay up late, in addition to diet, eat less greasy food, eat more light food, more exercise.