In this article 8 sections
High blood pressure often causes no noticeable symptoms, so it can be difficult to understand why treatment matters when you feel well. Over time, raised pressure can damage blood vessels and place extra strain on organs throughout the body. Bringing it under control helps reduce the risk of problems affecting the heart, brain, kidneys and eyes.
Damage can develop before you notice a problem
Blood vessels carry oxygen and nutrients to every part of the body. When pressure remains high, their walls can become damaged and less able to do their job. This can contribute to narrowing and blockages that restrict blood flow.
These changes often develop gradually. Feeling energetic or having no headache does not tell you whether your blood pressure is controlled. Regular measurements and the checks your doctor recommends provide a more useful picture.
The heart has to work harder
When blood pressure stays high, the heart must work harder to push blood around the body. Its muscle may thicken and become less efficient over time. This can contribute to heart failure, a condition in which the heart cannot pump blood well enough to meet the body's needs.
High blood pressure also increases the risk of disease in the arteries supplying the heart. If blood flow through one of these arteries becomes blocked, a heart attack can occur. Heart failure and a heart attack are different conditions, although a person can have both.
The brain depends on a steady blood supply
High blood pressure can damage arteries supplying the brain and increase the risk of stroke. A stroke happens when a blood vessel becomes blocked or bursts, interrupting the supply of oxygen to part of the brain.
The effects depend on the area involved and may include difficulty moving, speaking, seeing or remembering. Controlling blood pressure is an important part of reducing stroke risk. Sudden symptoms need emergency help, even if they begin to improve.
The kidneys and blood pressure affect each other
Your kidneys filter waste and extra fluid from the blood. High blood pressure can damage the small blood vessels that support this work. As kidney function worsens, fluid can build up and make blood pressure harder to control.
This relationship works in both directions: kidney disease can cause high blood pressure, and high blood pressure can worsen kidney disease. Early kidney damage may cause no symptoms, so your doctor may recommend blood and urine tests even when you feel well.
Small blood vessels in the eyes can be affected
High blood pressure can harm the tiny vessels supplying the retina, the light-sensitive tissue at the back of the eye. Damage can affect vision. Having diabetes as well as high blood pressure increases the risk of eye problems.
Tell your doctor about changes in your sight and ask which eye checks are appropriate for you. A sudden loss or major change in vision needs urgent assessment rather than waiting for a routine appointment.
Follow up looks beyond the blood pressure reading
Your doctor may use a blood test to assess how well your kidneys filter blood and a urine test to look for albumin, a protein that can leak into urine when the kidneys are damaged. The tests serve different purposes, so one does not automatically replace the other.
Ask what each test is checking, what the result means and when it should be repeated. Keep dated results with your blood pressure record and medicine list. This makes it easier to review changes over time and carry the same information between appointments.
Consistent care helps reduce the risk
Treatment combines the plan prescribed by your doctor with habits you can maintain, such as reducing salt, staying active within your abilities and avoiding tobacco. Your doctor will recommend a blood pressure target that fits your health and treatment needs.
Continue medicines as prescribed even when you feel well. If side effects or practical difficulties make treatment hard to follow, discuss them with your doctor. Changes to a prescription or dose should follow your doctor's advice or a plan already agreed with them.
Recognise symptoms that need immediate help
New persistent chest pain, severe breathlessness, a drooping face, sudden weakness on one side or difficulty speaking need emergency medical help. Do not delay care to check your blood pressure repeatedly. If you feel well but a reading is unusually high, follow the urgent-action instructions agreed with your doctor.