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Hypertension: A General Overview
What Is It?
Hypertension means persistently elevated blood pressure (BP) - the force of blood pushing against the walls of your arteries is too high. In the general population, BP follows a roughly normal distribution, and any single number used as a cutoff is somewhat arbitrary. That said, death from both heart disease and stroke rises progressively starting from BP as low as 115/75 mmHg - there is no truly "safe" floor once BP climbs above the theoretical minimum risk level of ~110-115 mmHg systolic.
- Comprehensive Clinical Nephrology, 7th Ed.
How Is It Classified?
The most widely used classification systems (numbers are in mmHg - systolic/diastolic):
| Category | Systolic | Diastolic |
|---|---|---|
| Normal | < 120 | < 80 |
| Elevated / Prehypertension | 120-129 | < 80 |
| Stage 1 Hypertension | 130-139 | 80-89 |
| Stage 2 Hypertension | ≥ 140 | ≥ 90 |
| Hypertensive Crisis | > 180 | > 120 |
The 2017 ACC/AHA guidelines lowered the threshold for Stage 1 to 130/80. European guidelines (ESH/ESC) use slightly different categories but agree on the same underlying risk relationship.
Is It Common?
Very. Elevated systolic BP is consistently identified by the Global Burden of Disease study as the leading contributor to disability-adjusted life years worldwide. In US adults over 20, it affects an enormous proportion of the population, with prevalence rising sharply with age and varying by race and sex.
Symptoms
Hypertension is often called the "silent killer" because it is typically asymptomatic until complications develop. When symptoms do appear, they are usually from the damage hypertension has caused, not the high pressure itself. Some people notice:
- Headache (especially at the back of the head)
- Dizziness or lightheadedness
- Visual disturbances (in severe cases)
- Nosebleeds (not reliably caused by hypertension, but associated)
Causes & Risk Factors
Primary (Essential) Hypertension - about 90-95% of cases. No single identifiable cause; driven by a combination of:
- Genetics (strong family history component)
- Age (BP rises with age - systolic increases throughout life, diastolic peaks around 50-60 then may fall)
- Obesity / excess visceral fat (promotes a pro-inflammatory state)
- High salt intake
- Physical inactivity
- Alcohol use
- Stress
- Race (higher prevalence and severity in Black adults)
Secondary Hypertension - about 5-10% of cases. Caused by an identifiable underlying condition:
- Chronic kidney disease (most common secondary cause)
- Primary hyperaldosteronism
- Obstructive sleep apnea
- Renal artery stenosis
- Pheochromocytoma (adrenal tumor)
- Thyroid disease
- Certain medications (NSAIDs, oral contraceptives, decongestants, stimulants)
Complications (Why It Matters)
Untreated or poorly controlled hypertension damages blood vessels and organs over time:
- Heart: Left ventricular hypertrophy, heart failure, coronary artery disease, heart attack
- Brain: Stroke (both ischemic and hemorrhagic), vascular dementia
- Kidneys: Chronic kidney disease, end-stage renal disease
- Eyes: Hypertensive retinopathy, vision loss
- Arteries: Peripheral artery disease (2.5x risk in men, 3.9x risk in women), aortic aneurysm
A rise of just 20 mmHg in systolic BP or 10 mmHg in diastolic BP is associated with a doubling of mortality from heart disease and stroke.
Diagnosis
BP should be measured on multiple occasions before diagnosing hypertension, since single readings can be elevated due to anxiety or activity ("white coat hypertension"). Key points:
- Use a properly calibrated cuff on a rested arm
- Confirm with repeat readings on separate visits
- Ambulatory BP monitoring (24-hour) is the most accurate method and avoids white coat effect
Treatment
1. Lifestyle Changes (First Line for Everyone)
- Weight loss - even modest reductions help significantly
- DASH diet (rich in fruits, vegetables, low-fat dairy; low sodium)
- Reduce sodium to < 2.3g/day (ideally < 1.5g/day)
- Regular aerobic exercise (150 min/week moderate intensity)
- Limit alcohol
- Stop smoking (smoking raises acute BP and accelerates vascular damage)
2. Medications
When lifestyle changes are insufficient, or BP is Stage 2, medications are added. The main drug classes:
| Class | Examples | Notes |
|---|---|---|
| Thiazide/thiazide-like diuretics | Chlorthalidone, hydrochlorothiazide | Often first choice; especially effective in older adults and Black patients |
| ACE inhibitors | Lisinopril, ramipril | Protective for kidneys in diabetics; avoid in pregnancy |
| ARBs (angiotensin receptor blockers) | Losartan, valsartan | Alternative to ACE inhibitors; fewer side effects |
| Calcium channel blockers | Amlodipine, nifedipine | Effective at all ages; useful for isolated systolic hypertension |
| Beta-blockers | Metoprolol, atenolol | Preferred when there is also heart failure or angina |
Most patients with Stage 2 hypertension need two or more drugs from different classes.
BP Targets:
- General adults: < 130/80 mmHg (ACC/AHA 2017/2025 guidelines)
- Older adults (age ≥ 65): < 130/80 is still recommended for most
- Patients with CKD or diabetes: < 130/80
3. Resistant Hypertension
Defined as BP above target despite optimal doses of 3 drugs including a diuretic. Occurs in roughly 9-20% of hypertensive patients. The most common cause is non-adherence to medication; secondary causes like sleep apnea and hyperaldosteronism are also important.
4. Hypertensive Emergency
BP > 180/120 mmHg WITH signs of acute organ damage (aortic dissection, stroke, kidney injury, cardiac ischemia) requires immediate IV treatment in an ICU. Without organ damage ("urgency"), oral medications and close follow-up are sufficient.
Recent Guideline Update
The 2025 AHA/ACC Hypertension Guideline (PMID: 40811516, published Oct 2025) is the most current major guideline covering prevention, detection, evaluation, and management of high BP in adults. It reinforces the < 130/80 mmHg target and multi-drug approach for Stage 2 disease.
Bottom line: Hypertension is common, largely asymptomatic, and highly treatable. The key is catching it early with regular BP checks, making lifestyle changes, and using medications when needed - because the damage it does to the heart, brain, and kidneys accumulates silently over years.
Want me to go deeper on any specific part - like how the medications work, how to measure BP correctly, or what happens during a hypertensive crisis?
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