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High Blood Pressure Causes: Understanding Hypertension

High blood pressure (hypertension) can have many causes, including lifestyle factors, genetics, and underlying conditions. Learn what triggers hypertension.

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Things worth knowing about "High Blood Pressure Causes"

High blood pressure (hypertension) can have many causes, including lifestyle factors, genetics, and underlying conditions. Learn what triggers hypertension.

What Is High Blood Pressure?

High blood pressure, medically known as hypertension, is diagnosed when blood pressure readings consistently exceed 140/90 mmHg. It is one of the most common chronic conditions worldwide and a major risk factor for heart attack, stroke, and kidney disease. The causes of high blood pressure are diverse and can be divided into two main categories: primary (essential) hypertension and secondary hypertension.

Primary Hypertension – Causes Without an Identifiable Underlying Condition

Primary or essential hypertension accounts for approximately 90–95% of all cases. In this form, no single, clear cause can be identified. Instead, multiple factors interact to raise blood pressure:

Genetic predisposition: A family history of hypertension significantly increases individual risk.
Unhealthy diet: High intake of sodium (salt), saturated fats, and processed foods promotes the development of hypertension.
Physical inactivity: Lack of exercise weakens the cardiovascular system and contributes to elevated blood pressure.
Chronic stress: Persistent psychological stress activates the sympathetic nervous system, leading to sustained increases in blood pressure.
Overweight and obesity: Excess body fat, particularly around the abdomen, places significant strain on the cardiovascular system.
Alcohol and tobacco use: Regular alcohol consumption and smoking damage blood vessel walls and raise blood pressure.
Increasing age: As people age, blood vessels lose elasticity, which tends to raise blood pressure.

Secondary Hypertension – High Blood Pressure Caused by an Underlying Condition

In approximately 5–10% of cases, high blood pressure is the result of another underlying medical condition. This is called secondary hypertension. Treating the underlying condition often leads to normalization of blood pressure. Common causes include:

Kidney Diseases

Conditions such as chronic kidney disease or renal artery stenosis (narrowing of the renal artery) are among the most frequent causes of secondary hypertension. The kidneys play a central role in regulating blood pressure through the management of fluid and salt balance.

Hormonal and Endocrine Disorders

Primary hyperaldosteronism (Conn syndrome): Overproduction of the hormone aldosterone by the adrenal glands leads to sodium and water retention.
Pheochromocytoma: A usually benign tumor of the adrenal gland that secretes excessive amounts of adrenaline and noradrenaline.
Cushing syndrome: Elevated cortisol levels raise blood pressure.
Thyroid disorders: Both overactive and underactive thyroid conditions can affect blood pressure.

Sleep Apnea

Obstructive sleep apnea syndrome is a frequently underestimated cause of high blood pressure. Repeated breathing pauses during sleep lead to oxygen deficiency and trigger stress hormone release, which raises blood pressure.

Medications and Substances

Certain medications and substances can raise blood pressure as a side effect:

Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac
Hormonal contraceptives (the pill)
Corticosteroids (cortisone)
Decongestant nasal sprays
Illegal drugs such as cocaine or amphetamines

Key Risk Factors at a Glance

The main risk factors for high blood pressure can be summarized as follows:

Family history (genetic predisposition)
High salt intake
Physical inactivity
Chronic stress
Overweight or obesity
Smoking and alcohol consumption
Older age
Diabetes mellitus
Kidney or adrenal gland disorders

When to See a Doctor

High blood pressure often causes no noticeable symptoms for a long time, which is why it is frequently diagnosed late – it is commonly referred to as the "silent killer." Regular blood pressure monitoring is therefore especially important. If readings above 140/90 mmHg are measured repeatedly, medical advice should be sought. Values above 180/120 mmHg constitute a hypertensive emergency requiring immediate medical care.

References

World Health Organization (WHO): Hypertension. Fact Sheet. Available at: https://www.who.int/news-room/fact-sheets/detail/hypertension
Williams B. et al.: 2018 ESC/ESH Guidelines for the management of arterial hypertension. European Heart Journal. 2018;39(33):3021–3104. doi:10.1093/eurheartj/ehy339
Whelton P.K. et al.: 2017 ACC/AHA High Blood Pressure Clinical Practice Guideline. Journal of the American College of Cardiology. 2018;71(19):e127–e248. doi:10.1016/j.jacc.2017.11.006

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