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What causes high blood pressure?
Key takeaways
- Most high blood pressure is primary (essential) hypertension: it develops over years from a mix of genes, age, and lifestyle, with no single cause.
- Secondary hypertension is caused by another condition or a medicine — such as kidney disease, sleep apnea, thyroid problems, or decongestants.
- Risk factors you can change: sodium, low potassium, inactivity, excess weight, alcohol, tobacco.
- Risk factors you can't: age, family history, sex, race or ethnicity.
Primary (essential) hypertension
For most adults, there's no single identifiable cause. Doctors call this primary or essential hypertension. It tends to develop gradually over many years as blood vessels stiffen with age and as genetics and daily habits add up. This is the most common type of high blood pressure.
Secondary hypertension
When high blood pressure is caused by another health condition or a substance, it's called secondary hypertension. It often appears more suddenly and can be higher than primary hypertension. The NHLBI lists causes including:
| Category | Examples |
|---|---|
| Health conditions | Chronic kidney disease, sleep apnea, thyroid problems, some tumors (including adrenal tumors), metabolic syndrome, obesity |
| Medicines | Decongestants, NSAID pain relievers (such as ibuprofen), hormonal birth control pills, some antidepressants |
| Substances | Cocaine, methamphetamine, and other stimulants; heavy alcohol use |
Secondary hypertension may be suspected if blood pressure is very high at a young age, rises suddenly, or stays high despite several medicines (resistant hypertension). Treating the underlying cause can lower blood pressure. Don't stop a prescribed medicine without talking to your doctor.
Risk factors for high blood pressure
Ones you can change
- A diet high in sodium and low in potassium — most sodium comes from processed and restaurant food, not the salt shaker.
- Physical inactivity.
- Overweight or obesity.
- Heavy alcohol use.
- Tobacco use, including vaping nicotine.
- Poor sleep and untreated sleep apnea.
Ones you can't change
- Age — risk rises as you get older.
- Family history and genetics.
- Sex — men are more likely to have high blood pressure before about age 65; women catch up after menopause.
- Race or ethnicity — in the US, Black adults are more likely to develop high blood pressure, often earlier in life.
- Having had high blood pressure during pregnancy.
What about stress?
Stress can cause short-term spikes in blood pressure, and chronic stress can push people toward habits that raise it — poor sleep, alcohol, less activity. Managing stress is part of the AHA's advice for lowering blood pressure.
See your patterns with Cardivo
Cardivo lets you log cuff readings with notes — sleep, salty meals, alcohol, a stressful day — next to heart rate, HRV, and stress. Over a few weeks, patterns become visible and easy to discuss with your doctor.
This guide is general wellness education based on the public sources below. It is not medical advice, diagnosis, or treatment. Cardivo is not a medical device. If you think you are having a medical emergency, call 911.
Frequently asked questions
What is the main cause of high blood pressure?
Most cases are primary (essential) hypertension, which has no single cause. It develops over years from a combination of age, genetics, and lifestyle factors such as high sodium intake, inactivity, excess weight, and alcohol.
What is essential hypertension?
Essential, or primary, hypertension is high blood pressure with no identifiable underlying cause. It's the most common type.
What is secondary hypertension?
Secondary hypertension is high blood pressure caused by another condition or substance — for example kidney disease, sleep apnea, thyroid problems, adrenal tumors, decongestants, NSAIDs, or stimulants.
Can stress cause high blood pressure?
Stress causes temporary rises in blood pressure and can contribute to habits that raise it long term. Managing stress is part of standard lifestyle advice.
Sources
- NHLBI — High blood pressure: causes and risk factors
- CDC — High blood pressure risk factors
- American Heart Association — What is high blood pressure?