Causes of High Blood Pressure

What causes high blood pressure?
Blood pressure is the measure of the force of blood pushing against blood vessel walls. The heart pumps blood into blood vessels, which carry the blood throughout the body. High blood pressure, also called hypertension, is dangerous because it makes the heart work harder to pump blood out to the body and contributes to hardening of the arteries, or atherosclerosis, to stroke, kidney disease, and to heart failure.

What Is "Normal" Blood Pressure?
A blood pressure reading is written like this: 120/80. It's read as "120 over 80." The top number is called the systolic, and bottom number is called the diastolic. The ranges are:

Normal: Less than 120 over 80 (120/80)
Elevated: 120-129/less than 80
Stage 1 high blood pressure: 130-139/80-89
Stage 2 high blood pressure: 140 and above/90 and above
Hypertension crisis: higher than 180/higher than 120 -- See a doctor right away
If your blood pressure is above the normal range, talk to your doctor about how to lower it.

What Causes High Blood Pressure?
The exact causes of high blood pressure are not known, but several things may play a role, including:

Smoking
Being overweight or obese
Lack of physical activity
Too much salt in the diet
Too much alcohol consumption (more than 1 to 2 drinks per day)
Stress
Older age
Genetics
Family history of high blood pressure
Chronic kidney disease
Adrenal and thyroid disorders
Sleep apnea
Essential Hypertension

Though essential hypertension remains somewhat mysterious, it has been linked to certain risk factors. High blood pressure tends to run in families and is more likely to affect men than women. Age and race also play a role. In the United States, blacks are twice as likely as whites to have high blood pressure, although the gap begins to narrow around age 44. After age 65, black women have the highest incidence of high blood pressure.