Blood pressure is a measure of how hard the blood pushes against the walls of your arteries as it moves through your body. It’s normal for blood pressure to go up and down throughout the day, but if it stays up, you have high blood pressure. Another name for high blood pressure is hypertension.
When blood pressure is high, it starts to damage the blood vessels, heart, and kidneys. This can lead to heart attack, stroke, and other problems. High blood pressure is called a "silent killer", because it doesn't usually cause symptoms while it is causing this damage.
Your blood pressure consists of two numbers: systolic and diastolic. Someone with a systolic pressure of 120 and a diastolic pressure of 80 has a blood pressure of 120/80, or "120 over 80".
Adults should have a blood pressure of less than 140/90. High blood pressure is 140/90 or higher. Many people fall into the category called high-normal (130–139/85–89) . People with high-normal levels need to make lifestyle changes to bring the blood pressure down and help prevent or delay high blood pressure.
In most cases, doctors can't point to the exact cause. But several things are known to raise blood pressure, including:
High blood pressure doesn't usually cause symptoms. Most people don't know they have it until they go to the doctor for some other reason.
Without treatment, high blood pressure can damage the heart, brain, kidneys, or eyes. This damage causes problems like coronary artery disease, stroke, and kidney failure.
Very high blood pressure can cause headaches, vision problems, nausea, and vomiting. These symptoms can also be caused by dangerously high blood pressure called malignant high blood pressure. It may also be called a hypertensive crisis or hypertensive emergency. Malignant high blood pressure is a medical emergency.
For your doctor to confirm that you have high blood pressure, your blood pressure must be at least 140/90 on three or more separate occasions. It is usually measured 1 to 2 weeks apart.
You may have to check your blood pressure at home if there is reason to think the readings in the doctor’s office aren't accurate. You may have what is called white-coat hypertension, which is blood pressure that goes up just because you're at the doctor’s office. Even routine activities, such as attending a meeting, can raise your blood pressure. So can commuting to work or smoking a cigarette.
Treatment depends on how high your blood pressure is, whether you have other health problems such as diabetes, and whether any organs have already been damaged. Your doctor will also consider how likely you are to develop other diseases, especially heart disease.
You can help lower your blood pressure by making healthy changes in your lifestyle. If those lifestyle changes don't work, you may also need to take pills. Either way, you will need to control your high blood pressure throughout your life.
Most people take more than one pill for high blood pressure. Work with your doctor to find the right pill or combination of pills that will cause the fewest side effects.