Health Conditions A-Z Cardiovascular Disorders What Is Hypertension? Often called the "silent killer," high blood pressure may have little to no symptoms. Still, you'll want to watch out for these warning signs. By Maggie O'Neill Maggie O'Neill Maggie O’Neill is a health writer and reporter based in New York who specializes in covering medical research and emerging wellness trends, with a focus on cancer and addiction. Prior to her time at Health, her work appeared in the Observer, Good Housekeeping, CNN, and Vice. She was a fellow of the Association of Health Care Journalists’ 2020 class on Women’s Health Journalism and 2021 class on Cancer Reporting. In her spare time, she likes meditating, watching TikToks, and playing fetch with her dog, Finnegan. health's editorial guidelines Updated on April 28, 2023 Medically reviewed by Rafle Fernandez, MD Medically reviewed by Rafle Fernandez, MD Rafle Fernandez MD, MBA, FACC, is a board-certified cardiologist practicing in Miami, Florida. learn more Share this page on Facebook Share this page on Twitter Share this page on Pinterest Email this page High blood pressure, or hypertension, can slowly develop and damage your blood vessels and organs over several years. Having high blood pressure is also a major risk factor for heart attack and stroke. Hypertension is dangerous since it usually presents with little or no symptoms. As a result, hypertension is often called the "silent killer." Luckily, hypertension is fairly easy to diagnose and can be treated with both lifestyle modifications and medication. Here's what you need to know about hypertension and how it may present in those affected. Getty Images What Is Blood Pressure? Blood pressure is the force of blood pushing on a blood vessel wall. Having your blood pressure measured is the primary way to know if your blood pressure is too high. You can check your own blood pressure at home or at a blood pressure machine in pharmacies and some retail stores, or have it measured by a healthcare provider. That blood pressure reading, measured by a gauge attached to an inflatable blood pressure cuff that wraps around your arm and gently tightens, comes in two different numbers. Systolic blood pressure is the pressure inside your arteries when your heart beats. Diastolic blood pressure is the pressure inside your arteries when your heart rests. Healthcare providers read your blood pressure in systolic over diastolic blood pressure format. For example, 120 over 80 (120/80) is considered the normal range for blood pressure. What To Know About a Blood Pressure Chart Hypertension Symptoms Hypertension often is asymptomatic, meaning that it does not produce symptoms. This is why it often goes unnoticed. However, some patients may show signs, such as stroke-like symptoms, chest pain, and shortness of breath. There are three "inconclusively related symptoms" of hypertension that are not always caused by it: blood spots in the eyes, facial flushing, and dizziness. Blood Spots in the Eyes This condition is called a subconjunctival hemorrhage. It is more common in people with diabetes or hypertension. The blood spots appear on the whites of the eye. The spots may seem alarming, but they usually heal on their own within a few days or weeks. Facial Flushing A red face from hypertension happens when blood vessels in the face dilate. While facial flushing isn't directly caused by hypertension, it may be related to blood pressure that is higher than normal. Dizziness Dizziness is a symptom that may be related to hypertension. Do not ignore sudden onset dizziness, loss of coordination and balance, and trouble walking. Those symptoms can indicate a stroke, for which hypertension is the leading cause. Symptoms of Hypertensive Crisis A hypertensive crisis is when blood pressure rises quickly and severely and reads 180/120 or higher. Readings in that range can lead to organ damage, heart attack, stroke, or loss of consciousness. Call 911 and seek urgent medical care if you have any of the following symptoms: Chest pain Shortness of breath Back pain Numbness or weakness Change in vision Difficulty speaking Severe headache Nosebleeds Severe anxiety Try relaxing for five minutes and then retake a reading if you get a high blood pressure reading but do not have any symptoms. Seek urgent medical care if the second reading is still 180/120 or greater. What Causes Hypertension? Hypertension often develops over time. Lifestyle factors, certain health conditions, genetics, and family history can increase your risk of developing high blood pressure. Lifestyle choices that can increase your risk include: Not getting regular physical activity Smoking Drinking too much alcohol Eating a diet that is too high in sodium and too low in potassium Certain health conditions or statuses—like diabetes, obesity, and pregnancy—can also result in high blood pressure. How To Prevent High Blood Pressure Regularly check your blood pressure and listen to a healthcare provider if they advise you to lower it. Unlike other health conditions, you cannot count on a symptom to signal that your blood pressure is dangerously high. Keeping your blood pressure under control consistently is essential, especially if a healthcare provider suggests you need to. Lifestyle changes are recommended for everyone with high blood pressure. Medication is often needed as well, and a number of very effective medications are available on a prescription basis. Your clinician may even recommend a combination of blood pressure medications, based on your individual case. Quit Smoking Consider quitting if you smoke. Smoking can damage your heart and blood vessels. Nicotine raises blood pressure, and breathing in carbon monoxide when lighting up reduces the amount of oxygen your blood can carry. Limit Alcohol Make sure not to drink alcohol excessively. The recommended limit is no more than one drink per day for women and two for men. Exercise Regularly Aim to get at least 150 minutes of moderate-intensity exercises, such as brisk walking or bicycling, weekly. For example, you could do at least 30 minutes of activity five days a week. Limit Your Salt and Up Your Potassium Intakes Too much sodium in your diet can raise your blood pressure. Limit your sodium intake if you have high blood pressure. Eat whole foods and limit or avoid processed foods since they are high in sodium. Having enough potassium in your diet is also important. Increasing your potassium intake can help you lower your blood pressure if it is high. Whole foods high in potassium include bananas, potatoes, beans, and yogurt. Get Enough Sleep Sleep is important for overall health. Adults should aim for at least seven hours per night. Additionally, try to lower your stress levels as much as possible. Getting a good night's rest can be helpful, as can taking time to unwind each day with activities you enjoy. How To Relieve Stress: 15 Ways You'll Want To Try A Quick Review High blood pressure, or hypertension, happens when force increases blood on blood vessel walls. Hypertension does not usually have symptoms. Therefore, regularly checking your blood pressure is essential to confirm that it's in a healthy range. Different factors, like genetics and lifestyle, can increase the chance of high blood pressure. Still, you can make changes to prevent high blood pressure, like getting regular exercise and getting enough sleep. Was this page helpful? Thanks for your feedback! Tell us why! Other Submit 14 Sources Health.com uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. American Heart Association. Health threats from high blood pressure. MedlinePlus. High blood pressure. American Heart Association. More than 100 million Americans have high blood pressure, AHA says. American Heart Association. Why high blood pressure is a "silent killer". Iqbal AM, Jamal SF. Essential hypertension. In: StatPearls. StatPearls Publishing; 2022. American Heart Association. What are the symptoms of high blood pressure? American Academy of Ophthalmology. What is a subconjunctival hemorrhage? American Heart Association. Hypertensive crisis: When you should call 911 for high blood pressure. Centers for Disease Control and Prevention. Know your risk for high blood pressure. Centers for Disease Control and Prevention. High blood pressure symptoms and causes. Department of Health and Human Services. Physical activity guidelines for Americans, 2nd edition. Centers for Disease Control and Prevention. Sodium, potassium and health. Academy of Nutrition and Dietetics. Processed foods: A closer look. Centers for Disease Control and Prevention. How much sleep do I need?