A low pressure that reaches 100 mmHg may be dangerous for the patient. The normal range for low pressure, or diastolic blood pressure, is 60-89 mmHg. When low pressure is in the range of 100-109 mmHg, a preliminary diagnosis of grade 2 hypertension can be made. If the patient is in the process of activity, emotional excitement, exercise, low pressure rises, it is a compensatory performance of the body. Generally, when the patient returns to normal, the blood pressure can return to normal and does not pose too much danger to the body. However, if a patient has a prolonged increase in low pressure at rest, it should be considered as possible hypertension. If the patient is hypertensive and the low pressure is not well controlled for a long time, the following dangers may occur: 1. Target organ damage: it may cause various target organ damage, for example, it may cause insufficient blood supply to the brain, cardiac hypertrophy and azotemia, proteinuria, etc.; 2. Cerebrovascular damage: if the low pressure is high and not well controlled, it may induce large cerebral infarction and cerebral hemorrhage, endangering the patient’s life; 3. Cardiovascular damage: it may lead to heart failure, myocardial infarction, which may cause cardiogenic shock and even endanger life; 4, kidney damage: it may cause acute and chronic renal insufficiency because of the decrease in glomerular filtration rate; 5, eye damage: it may lead to small arteriosclerosis and hemorrhage in the fundus of the eye, which may affect the vision of serious patients and lead to blindness; 6, other: long-term high low pressure may lead to systemic Extensive vascular endothelial damage, thus inducing atherosclerosis in different parts of the body, and in serious cases, severe arterial stenosis and nasal congestion can occur. In summary, if elevated low pressure occurs, it should be taken seriously because it is likely to induce various adverse events. For patients with high low pressure, attention should be paid to improving poor lifestyle and applying antihypertensive drugs as prescribed by the doctor to control blood pressure in the normal range, while exercise should be increased appropriately.