High blood pressure is sometimes called a silent condition because many people feel perfectly normal even when their readings are dangerously high. What many people do not realise is that uncontrolled blood pressure can gradually damage the kidneys.
In fact, high blood pressure is the second leading cause of kidney failure (after diabetes), but because it rarely causes symptoms in its early stages, many people have no idea their kidneys are being harmed until significant, irreversible damage has already occurred.
Here is how and why it happens so silently:
1. The kidneys contain tiny blood vessels: These vessels help filter waste from the blood. High pressure can damage them over time.
2. Damage may develop without pain: Kidney disease caused by hypertension often has no obvious early symptoms.
3. Protein may appear in urine: Damaged kidney filters can allow albumin, a type of protein, to leak into urine.
4. Kidney function may gradually decline: Continued damage can reduce the kidneys’ ability to remove waste and balance fluids.
5. The relationship works both ways: Kidney disease can also cause or worsen high blood pressure.
6. Tests can detect problems: Blood creatinine and eGFR tests, together with urine albumin testing, help assess kidney health.
7. Treatment can reduce further damage: Blood pressure medicines, lifestyle changes and regular monitoring can help protect kidney function.
How can you protect yourself?
Check your blood pressure regularly, take prescribed medication consistently and reduce excessive salt intake. Maintain a healthy weight, exercise and avoid smoking.
Do not stop blood pressure medication because you feel better. High blood pressure often has no symptoms, and stopping treatment can allow it to rise again.
People with diabetes or existing kidney disease may need more frequent monitoring.
If you have persistent headaches, chest pain, severe breathlessness or neurological symptoms alongside a very high blood pressure reading, seek urgent medical care.
Protecting your blood pressure is one of the important steps you can take to protect your kidneys and heart.
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