Blood pressure is the hemodynamic force produced by the heart’s contraction against the resistance of the arterial system.<\/p>\n\n\n\n
The left ventricle generates this force by ejecting approximately 60 to 100 milliliters of blood per beat into the aorta.<\/p>\n\n\n\n
The arterial walls absorb part of this force through their elastic properties.<\/p>\n\n\n\n
Healthy, compliant arteries buffer the pressure wave, keeping the gap between systolic and diastolic values within the normal pulse pressure range of 40 to 60 mmHg.<\/p>\n\n\n\n
Blood pressure fluctuates continuously throughout the day in response to physical activity, emotional stress, posture, hydration, sleep, and medication.<\/p>\n\n\n\n
A single measurement does not establish a diagnosis.<\/p>\n\n\n\n
The American Heart Association recommends averaging readings taken on at least two separate occasions before classifying blood pressure status.<\/p>\n\n\n\n
For a full breakdown of every blood pressure category with clinical thresholds and example readings, see the blood pressure chart<\/a>.<\/p>\n\n\n\n The American Heart Association classifies blood pressure into seven categories based on the combination of systolic and diastolic values.<\/p>\n\n\n\n Each category carries a different cardiovascular risk level and requires a different clinical response.<\/p>\n\n\n\n Some readings display abnormal values in only one number while the other remains within the normal range.<\/p>\n\n\n\n Isolated systolic hypertension (ISH), isolated diastolic hypertension (IDH), and isolated diastolic hypotension (IDA) are classified separately from the seven standard categories and carry distinct clinical implications.<\/p>\n\n\n\n For a searchable index of specific readings with individual clinical explanations, see the blood pressure readings guide<\/a>.<\/p>\n\n\n\n Hypertension is defined as blood pressure consistently at or above 130\/80 mmHg under current AHA\/ACC guidelines.<\/p>\n\n\n\n The World Health Organization estimated in 2023 that approximately 1.28 billion adults worldwide live with hypertension, making it the most prevalent modifiable cardiovascular risk factor globally.<\/p>\n\n\n\n Primary hypertension accounts for 90 to 95% of all cases and develops without a single identifiable cause.<\/p>\n\n\n\n Secondary hypertension accounts for the remaining 5 to 10% and arises from a specific underlying condition, most commonly chronic kidney disease, primary aldosteronism, or obstructive sleep apnea.<\/p>\n\n\n\n The principal modifiable risk factors for primary hypertension are high dietary sodium intake, physical inactivity, excess body weight, excessive alcohol consumption, and chronic psychological stress.<\/p>\n\n\n\n Non-modifiable risk factors include advancing age, family history, and male sex before age 55.<\/p>\n\n\n\n Hypertension produces no symptoms in the majority of affected individuals, which is why consistent monitoring remains the only reliable method of early detection.<\/p>\n\n\n\n Untreated hypertension progressively damages the arterial walls, heart, kidneys, and cerebral vasculature over years before producing clinical events.<\/p>\n\n\n\n For a complete guide to hypertension mechanisms, risk factors, stages, and treatment options, see the hypertension guide<\/a>.<\/p>\n\n\n 27 Dangers And Risks Of High Blood Pressure<\/a><\/p><\/div><\/div>\n How To Live With High Blood Pressure?<\/a><\/p><\/div><\/div>\n 12 Ways To Effectively Prevent High Blood Pressure<\/a><\/p><\/div><\/div>\n What Are The Diagnosis And Tests For High Blood Pressure?<\/a><\/p><\/div><\/div>\n 10 Effective High Blood Pressure Treatment Methods: Your Essential Guide To Beating Hypertension<\/a><\/p><\/div><\/div>\n 15 Causes Of High Blood Pressure: Your Essential Guide To Navigating Hypertension Triggers<\/a><\/p><\/div><\/div>\n 11 Crucial Symptoms Of High Blood Pressure You Shouldn’t Ignore<\/a><\/p><\/div><\/div>\n 11 Home Remedies For High Blood Pressure<\/a><\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n Hypotension is defined as blood pressure below 90\/60 mmHg.<\/p>\n\n\n\n Hypotension is not classified as a disease state in the absence of symptoms, because many individuals with low readings maintain adequate organ perfusion and experience no adverse effects.<\/p>\n\n\n\n Orthostatic hypotension describes a drop in systolic pressure of at least 20 mmHg, or diastolic pressure of at least 10 mmHg, within three minutes of standing from a lying or seated position.<\/p>\n\n\n\n Neurally mediated hypotension occurs when the autonomic nervous system fails to maintain vascular tone during prolonged standing.<\/p>\n\n\n\n Severe hypotension below 80\/50 mmHg represents a medical emergency regardless of symptom status.<\/p>\n\n\n\n Dehydration, blood loss, prolonged bed rest, certain medications (diuretics, beta-blockers, antidepressants), endocrine disorders, and autonomic neuropathy are the most frequent causes of clinically significant hypotension.<\/p>\n\n\n\n For a full clinical breakdown of hypotension types, diagnostic criteria, causes, and management, see the hypotension guide<\/a>.<\/p>\n\n\n 8 Risk Factors Of Low Blood Pressure<\/a><\/p><\/div><\/div>\n 10 Steps To Live With Low Blood Pressure<\/a><\/p><\/div><\/div>\n 6 Dangers And Risks Of Low Blood Pressure<\/a><\/p><\/div><\/div>\n 10 Methods To Prevent Low Blood Pressure: Steps Toward Optimal Health<\/a><\/p><\/div><\/div>\n 7 Diagnosis And Tests For Low Blood Pressure: A Comprehensive Guide<\/a><\/p><\/div><\/div>\n 5 Low Blood Pressure Treatment Methods: From Lifestyle Changes To Medication<\/a><\/p><\/div><\/div>\n 5 Causes Of Low Blood Pressure You Might Not Know About<\/a><\/p><\/div><\/div>\n 15 Symptoms Of Low Blood Pressure To Watch Out For<\/a><\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n Blood pressure is measured using a sphygmomanometer, which consists of an inflatable cuff connected to a pressure gauge.<\/p>\n\n\n\n The cuff is positioned on the upper arm at heart level and inflated to occlude the brachial artery.<\/p>\n\n\n\n As the cuff deflates, the device records the pressure at which arterial blood flow resumes (systolic) and the pressure at which it flows freely again (diastolic).<\/p>\n\n\n\n The AHA measurement protocol specifies five minutes of seated rest before the first reading, two readings taken one minute apart, and averaging the results.<\/p>\n\n\n\n Morning and evening measurements taken over seven consecutive days provide the most clinically reliable home blood pressure profile.<\/p>\n\n\n\n Wrist monitors and cuffless wearable devices produce less accurate results than validated upper-arm cuffs and are not recommended for clinical decision-making by current guidelines.<\/p>\n\n\n\n For a step-by-step measurement protocol and a guide to avoiding the most common measurement errors, see the how to take blood pressure guide<\/a>.<\/p>\n\n\n\n Blood pressure reduction at the elevated and Stage 1 range relies primarily on lifestyle modification.<\/p>\n\n\n\n Pharmacological treatment is added at Stage 1 when cardiovascular risk is high, and is standard at Stage 2.<\/p>\n\n\n\n Sodium restriction to below 1,500 mg per day reduces systolic blood pressure by 5 to 6 mmHg on average.<\/p>\n\n\n\n The DASH dietary pattern reduces systolic blood pressure by 8 to 14 mmHg in hypertensive individuals.<\/p>\n\n\n\n Regular aerobic exercise of 150 minutes per week reduces systolic blood pressure by 4 to 9 mmHg.<\/p>\n\n\n\n Each kilogram of body weight lost produces approximately 1 mmHg of systolic blood pressure reduction.<\/p>\n\n\n\n Reducing alcohol to moderate intake reduces systolic blood pressure by 2 to 4 mmHg.<\/p>\n\n\n\n Combining multiple interventions produces additive effects, and adults with Stage 1 hypertension who implement all five changes simultaneously can achieve reductions equivalent to a single antihypertensive medication.<\/p>\n\n\n\n For a full implementation guide with specific targets and timelines for each intervention, see the how to lower blood pressure guide<\/a>.<\/p>\n\n\n Antihypertensive medications are classified into nine drug classes, each acting on a different component of the blood pressure regulation system.<\/p>\n\n\n\n Clinicians select drug class based on the patient’s comorbidities, the mechanism driving the hypertension, and the target organ protection profile required.<\/p>\n\n\n\n Most patients with Stage 2 hypertension require two or more agents from different classes to achieve the target blood pressure below 130\/80 mmHg.<\/p>\n\n\n\n For a complete guide to each drug class with mechanisms, indications, contraindications, and common side effects, see the What Are The Blood Pressure Ranges?<\/span><\/h2>\n\n\n\n
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What Causes High Blood Pressure (Hypertension)?<\/span><\/h2>\n\n\n\n
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Blood Pressure Medications<\/span><\/h2>\n\n\n\n
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