High blood pressure is caused by what is it?

Hypertension of unknown etiology, and pathogenesis-related factors are

1. Age: the incidence rate increased with age but the trend over 40 years of age the incidence rate.

2. Salt: salt intake more persons, a high incidence of hypertension, there is that the salt <2g / day, almost non-occurrence of high blood pressure; 3-4g / day, hypertension and the incidence of 3% ,4-15g / day, the incidence the rate of 33.15%,> 20g / day incidence of 30%.

3. Weight: a high incidence of obesity.

4. Genetics: About half of the patients have a family history of high blood pressure.

5. Environmental and Occupational: There is excessive noise at work, excessive mental tension are prone to high blood pressure, high incidence of urban than rural.

Blood pressure regulation and control mechanism

A variety of factors can cause high blood pressure. Heart pump capacity strengthening (such as the increase in cardiac contractile force, etc.), so that every second to pump the blood to increase. Another factor is the loss of the normal elasticity of arteries become stiff, when the heart pump blood, it can not effectively expand, so the flow of blood pumped per heart beat through the small space than normal, resulting in increased pressure. This is more than high blood pressure occurs in atherosclerosis leading to arterial wall thickening, and the reasons for the elderly has become rigid. As the nerves and blood hormone stimulation, systemic small arteries may also cause a temporary contraction in the increased blood pressure. High blood pressure may lead to the third factor is the increase in circulating fluid volume. This is common in kidney disease, kidney can not adequately discharge sodium and water from the body, the body to increase blood volume, resulting in blood pressure.

On the contrary, if the pump limited the ability of the heart, blood vessels expand or excessive fluid loss can lead to decreased blood pressure. These factors mainly through the kidney function and autonomic nervous system (the nervous system to automatically adjust the body parts of many of the features) changes in regulation.