What Is Hypertension?
Systemic arterial hypertension (HTN) is a multifactorial clinical condition characterized by elevated and sustained blood pressure levels (BP ≥ 140/90 mmHg in the office). It is the leading modifiable risk factor for cardiovascular, cerebrovascular, and renal disease — responsible for more than 10 million deaths annually worldwide.
It affects roughly 32% of the Brazilian adult population (more than 36 million people) and prevalence rises with age, reaching 60-70% above age 60. Hypertension is called the "silent killer" because it often causes no symptoms until target-organ damage is already established.
In 90-95% of cases, hypertension is primary (essential) — without a single identifiable cause, resulting from the interaction of genetic, environmental, and behavioral factors. The remaining 5-10% are secondary hypertension, caused by identifiable conditions such as renovascular disease, primary aldosteronism, pheochromocytoma, or sleep apnea.
Target-Organ Damage
Chronically elevated pressure damages the heart (ventricular hypertrophy), brain (stroke), kidneys (nephrosclerosis), eyes (retinopathy), and arteries (accelerated atherosclerosis).
Silent and Progressive
Most hypertensive patients are asymptomatic. The disease progresses silently for years until it manifests as heart attack, stroke, or kidney failure.
Treatable and Preventable
A 10 mmHg reduction in systolic BP reduces the risk of stroke by 27%, heart attack by 17%, and heart failure by 28%. Prevention begins with lifestyle changes.
Pathophysiology
Blood pressure is determined by the product of cardiac output (volume of blood pumped per minute) and peripheral vascular resistance (arteriolar tone). In essential hypertension, peripheral vascular resistance is chronically elevated due to endothelial dysfunction, vascular remodeling, and neurohumoral activation.
The renin-angiotensin-aldosterone system (RAAS) is the main long-term BP regulator. Angiotensin II is a potent vasoconstrictor that also stimulates aldosterone secretion (sodium retention), activates the sympathetic nervous system, and promotes vascular and cardiac fibrosis and hypertrophy.
Endothelial Dysfunction and Arterial Stiffness
The vascular endothelium produces nitric oxide (NO), the main endogenous vasodilator. In hypertension, oxidative stress reduces NO bioavailability, causing persistent vasoconstriction. Endothelial dysfunction is an early event that precedes and contributes to BP elevation.
With aging and chronic hypertension, the large arteries (aorta, carotids) lose elasticity — arterial stiffness increases, raising systolic pressure and widening the pulse pressure. Arterial stiffness is an independent predictor of cardiovascular events and a marker of cumulative vascular damage.
Symptoms
Hypertension is typically asymptomatic. When symptoms occur, they generally indicate target-organ damage already established or a hypertensive crisis. The absence of symptoms does not mean adequate control — the only way to know whether pressure is elevated is by measuring it.
Signs and Symptoms Associated with Hypertension
- 01
Morning occipital headache
Occipital headache on waking that improves through the day. When present, it may indicate very high pressure levels. Still, most headaches are not caused by hypertension.
- 02
Dizziness and tinnitus
Non-rotatory dizziness and continuous tinnitus may accompany BP elevations, but they are nonspecific and also common in non-hypertensive individuals.
- 03
Epistaxis (nosebleed)
Although popularly tied to hypertension, epistaxis is more often caused by local factors. That said, uncontrolled hypertension may facilitate bleeding.
- 04
Exertional dyspnea
May indicate left ventricular hypertrophy or heart failure — complications of untreated chronic hypertension.
- 05
Visual changes
Blurred vision or scotomas (spots in the visual field) may indicate hypertensive retinopathy or hypertensive crisis.
- 06
Nocturia
Waking at night to urinate may be an early sign of hypertensive renal damage (nephrosclerosis) or nocturnal hypertension.
Diagnosis
Diagnosis of hypertension requires multiple elevated measurements in at least two separate visits, or confirmation by ABPM (24-hour ambulatory blood pressure monitoring) or HBPM (home blood pressure monitoring). "White-coat hypertension" (elevation only in the office) must be excluded.
Initial evaluation includes history, physical examination (palpation of pulses, fundoscopy), laboratory tests (creatinine, potassium, blood glucose, lipid panel, uric acid, urinalysis, microalbuminuria), and electrocardiogram. Echocardiography is indicated to assess left ventricular hypertrophy and cardiac function.
🏥Blood Pressure Classification in Adults
- 1.Normal: BP < 120/80 mmHg
- 2.Pre-hypertension: BP 120-139/80-89 mmHg
- 3.Stage 1 hypertension: BP 140-159/90-99 mmHg
- 4.Stage 2 hypertension: BP 160-179/100-109 mmHg
- 5.Stage 3 hypertension: BP ≥ 180/110 mmHg
Differential Diagnosis
Primary (essential) hypertension accounts for 90-95% of cases. Workup for secondary causes is indicated in young patients, those with hard-to-control hypertension, or those with suggestive clinical findings.
DIAGNÓSTICO DIFERENCIAL
Differential Diagnosis
Hypertension Secondary to Kidney Disease
- Elevated creatinine
- Proteinuria
- Edema
- Hypertension + hematuria = nephrologist
Testes Diagnósticos
- Creatinine
- Urinalysis
- Renal ultrasound
Pheochromocytoma
- Paroxysmal hypertensive crises
- Headache, sweating, palpitations
- Paroxysmal hypertension = rule out pheochromocytoma
Testes Diagnósticos
- Urinary metanephrines
Primary Hyperaldosteronism
- Hypertension + hypokalemia
- Adrenal adenoma
- Elevated aldosterone-to-renin ratio
Testes Diagnósticos
- Aldosterone-to-renin ratio
- Adrenal CT
Renal Artery Stenosis
- Hard-to-control hypertension in young patients
- Abdominal bruit
- Fibromuscular dysplasia or atherosclerosis
Testes Diagnósticos
- Renal Doppler
- MR angiography
Obstructive Sleep Apnea-Hypopnea Syndrome
Read more →- Snoring
- Morning hypertension
- Daytime sleepiness
Testes Diagnósticos
- Polysomnography
Pheochromocytoma: The Diagnosis That Cannot Be Missed
Pheochromocytoma accounts for fewer than 0.5% of hypertension cases, but it can be fatal if undiagnosed. The classic clinical triad — headache, sweating, and palpitations, often in paroxysmal crises — should always raise suspicion. Hypertension may be persistent or paroxysmal; crises are triggered by abdominal compression, anesthesia, medications, or tyramine-rich foods.
Fractionated plasma metanephrines have a sensitivity above 97% for diagnosis — they are the test of choice. Urinary metanephrines on a 24-hour collection are an alternative with good sensitivity. Imaging (abdominal CT or MRI) localizes the tumor after biochemical confirmation. The acupuncture physician does not treat pheochromocytoma, but should recognize the clinical presentation and refer urgently to a specialist.
Primary Hyperaldosteronism: The Most Common Treatable Cause
Primary hyperaldosteronism (Conn syndrome) is the most prevalent cause of secondary hypertension, responsible for 5 to 15% of resistant hypertension cases. Excess aldosterone retains sodium and excretes potassium, causing hypokalemia — though up to 40% of patients have normal potassium. Unilateral adrenal adenoma and bilateral adrenal hyperplasia are the most common etiologies.
The plasma aldosterone-to-renin ratio is the screening test; fasting and proper collection are critical for a valid result. Adrenal CT localizes adenomas larger than 6 mm. Adrenal vein catheterization is the gold standard for lateralization before surgery. Adenoma-related hyperaldosteronism has a curative surgical treatment; bilateral hyperplasia is treated with mineralocorticoid antagonists (spironolactone).
Sleep Apnea: Reversible Cause of Resistant Hypertension
Obstructive sleep apnea-hypopnea syndrome (OSAHS) is an important and underestimated cause of arterial hypertension. Intermittent hypoxemia and repeated sympathetic activation during apneas raise blood pressure, especially in the morning. More than 50% of patients with resistant hypertension have OSAHS.
CPAP (continuous positive airway pressure) reduces blood pressure in patients with moderate to severe OSAHS, especially when adherence is high. Polysomnography is the standard diagnostic test. The acupuncture physician evaluates sleep profile in all patients with hard-to-control hypertension, recognizing OSAHS as a treatable cause.
Treatment
Treatment combines lifestyle changes (for all patients) and pharmacotherapy (when BP targets are not achieved or cardiovascular risk is high). The general target is BP below 140/90 mmHg, with lower targets (below 130/80 mmHg) for high-risk patients.
Lifestyle Changes
Sodium restriction (< 5 g salt/day), DASH diet (rich in fruits, vegetables, low-fat dairy), weight loss (each kg lost reduces BP by 1 mmHg), regular aerobic exercise (150 min/week), alcohol moderation, and smoking cessation.
Initial Monotherapy
ACE inhibitors (enalapril, ramipril), ARBs (losartan, valsartan), CCBs (amlodipine), or thiazide diuretics (hydrochlorothiazide, chlorthalidone). Choice depends on comorbidities, race, and individual tolerance.
Combination Therapy
Most hypertensive patients require 2 or more drugs. Preferred combinations: ACEi/ARB + CCB, ACEi/ARB + diuretic, CCB + diuretic. Fixed-dose combination tablets improve adherence.
Resistant Hypertension
BP above target despite 3 drugs at optimal doses (including a diuretic). Spironolactone as a 4th drug. Rule out secondary causes and pseudoresistance (poor adherence, white-coat hypertension). Acupuncture as adjunct.
Acupuncture as Treatment
Proposed mechanisms for acupuncture in hypertension include possible autonomic nervous system modulation (reduction of sympathetic activity and increased vagal tone) and influence on cardiovascular centers in the brainstem. The exact pathways are still under investigation and are not fully established.
Some studies suggest that electroacupuncture may be associated with modest reductions in blood pressure in subgroups of patients, but results are heterogeneous and the magnitude of effect is not consistently reproduced. Acupuncture should not be substituted for prescribed antihypertensive treatment.
Acupuncture does not replace pharmacologic antihypertensive treatment. It is an adjunct that may contribute to better BP control, especially in patients with a stress and sympathetic-hyperactivity component. It may be particularly useful in resistant hypertension as complementary therapy.
Prognosis
Untreated hypertension reduces life expectancy by 5-10 years. The risk of cardiovascular events doubles with each 20 mmHg increase in systolic or 10 mmHg increase in diastolic above 115/75 mmHg.
With adequate treatment, cardiovascular risk can drop to levels close to those of normotensive individuals. A reduction of just 5 mmHg in systolic BP sustained for 5 years reduces the risk of stroke by 14% and coronary events by 9%.
Target-organ damage (ventricular hypertrophy, microalbuminuria, retinopathy) indicates greater severity and worsens prognosis. Strict BP control in these cases may stabilize or regress lesions, especially left ventricular hypertrophy.
Myths and Facts
Myth vs. Fact
High blood pressure causes symptoms — if I don't feel anything, I don't have hypertension
Hypertension is asymptomatic in the vast majority of cases. The only way to detect it is to measure BP regularly. By the time symptoms appear, organ damage is already established.
Once my BP is normal, I can stop the medication
BP normalizes BECAUSE the medication is working. Stopping treatment causes BP to rise again. Hypertension is chronic and requires ongoing treatment.
BP medication is addictive or harms the kidneys
Antihypertensives don't cause dependence. On the contrary, they protect the kidneys — untreated hypertension is what causes chronic kidney disease and kidney failure.
Lemon, chayote, and other home remedies control BP
No single food replaces medical treatment of hypertension. A healthy diet (DASH) helps, but it doesn't eliminate the need for medication when indicated.
Hypertension is a problem of the elderly — young people don't need to worry
Hypertension can develop at any age. Lifestyle in youth determines future risk. Screening is recommended starting at age 18.
When to Seek Help
Hypertensive crises can be medical emergencies requiring immediate care.
Frequently Asked Questions
Frequently Asked Questions
Primary (essential) hypertension generally cannot be cured, but it can be controlled excellently with appropriate treatment. In some patients — especially after significant weight loss, a healthy lifestyle, and elimination of secondary causes — it may be possible to reduce or discontinue medications under medical supervision. Secondary hypertension can be cured by treating the underlying cause.
No, not without medical guidance. BP normalizes precisely because the medication is working. Stopping without guidance can cause rebound hypertension and increase the risk of cardiovascular events. Only your physician can assess whether discontinuation is safe — usually after sustained control with lifestyle changes and improved risk factors.
Uncontrolled hypertension is the leading modifiable risk factor for stroke, myocardial infarction, heart failure, chronic kidney disease, atrial fibrillation, and vascular dementia. Cardiovascular risk doubles with each 20 mmHg increase in systolic BP or 10 mmHg in diastolic BP above 115/75 mmHg.
Some clinical studies suggest that acupuncture may be associated with modest BP reductions in subgroups of patients, but results are heterogeneous and evidence is still limited. Proposed mechanisms involve possible autonomic nervous system modulation. Acupuncture does not replace prescribed antihypertensives: the acupuncture physician can integrate it as complementary therapy, always alongside conventional treatment, with regular BP monitoring by the attending physician.
For most adults, the target is BP below 140/90 mmHg. For patients with high cardiovascular risk (diabetes, kidney disease, established coronary disease), the target is stricter: below 130/80 mmHg. In frail elderly patients over age 80, less strict targets may be more appropriate. The physician tailors the target to risk profile.
Reduce sodium to less than 2,000 mg/day (about 5 g of table salt). A 2 g/day cut in sodium reduces systolic BP by 4-5 mmHg. Processed salt (industrial foods, cold cuts, preserves, fast food) accounts for 70-75% of sodium intake — more than the salt added during preparation. Reading labels and prioritizing fresh foods are essential.
Yes. Regular aerobic exercise (150 minutes per week of moderate intensity, such as brisk walking, cycling, or swimming) reduces systolic BP by 5-8 mmHg. Resistance training (weights) complements the effect. The benefit is comparable to a low-dose antihypertensive medication. Patients on beta-blockers or diuretics should have hydration and intensity monitored by their physician.
Yes. Regular alcohol consumption above 2 drinks/day raises BP and is a treatable cause of secondary hypertension. Cutting alcohol lowers systolic BP by 3-4 mmHg. Beyond the direct hypertensive effect, alcohol interferes with the efficacy of some antihypertensives and increases the risk of hemorrhagic stroke.
For reliable home measurement: use a validated arm device (not a wrist device); sit at rest for 5 minutes with your arm supported at heart level; always measure at the same time (morning and evening); record 2 measurements 1 minute apart and note the average. Avoid coffee, cigarettes, and exercise in the 30 minutes beforehand. Bring your BP diary to consultations.
The acupuncture physician can integrate acupuncture into conventional hypertension treatment, especially for stress reduction (a sympathetic nervous system activator), improved sleep quality (often disturbed in hypertension), and anxiety control. Acupuncture does not replace medications when indicated, but it can enhance results as part of a physician-supervised integrative approach.
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