The changes behind heart disease and stroke build quietly over decades. Here's how blood vessels age, why blood flow matters and what to check.
Heart health is really about your whole circulation, meaning the heart doing the pumping and the network of blood vessels carrying blood to every part of your body. The changes that lead to heart attack and stroke usually build quietly over decades, long before they cause symptoms. The useful part is that the main risk factors can be measured, so you don't have to wait for a warning sign to find out where you stand.
How blood vessels change with age
Healthy arteries aren't rigid pipes. They're elastic, stretching a little with each heartbeat and springing back to help push blood along. Over the years, the walls gradually become stiffer. Stiffer arteries make the heart work harder, and this is one reason blood pressure tends to creep up with age.
The inside of every blood vessel is lined with a thin layer of cells called the endothelium. It isn't just a smooth surface. It releases substances that help vessels relax and widen, keep blood flowing smoothly and limit inflammation in the vessel wall. Smoking, high blood pressure, high blood sugar, inactivity and ageing all wear down how well this lining works, and that's one of the earliest changes on the road to heart disease.
Plaque builds slowly and quietly
Atherosclerosis is the build-up of plaque inside artery walls. Plaque is made of cholesterol, inflammatory cells, calcium and other material. It can begin in early adulthood and grows slowly, narrowing arteries over many years.
Narrowed arteries can cause chest pain or breathlessness on exertion, but often there are no symptoms at all until a plaque breaks open and a clot forms. That's what causes most heart attacks and many strokes. It's why waiting until you feel something is a poor way to look after your heart.
Why blood flow matters beyond your heart
Every organ depends on a steady blood supply, so the health of your blood vessels shows up in more places than the chest.
- Brain. Reduced blood flow to the brain raises the risk of stroke and is linked with changes in memory and thinking over time.
- Kidneys. These are full of small blood vessels and are sensitive to high blood pressure and high blood sugar.
- Legs. Narrowed arteries in the legs can cause cramping pain when walking that settles with rest.
- Sexual function. In men, erection problems can be an early sign of blood vessel disease and are worth mentioning to a doctor.
- Exercise capacity. Muscles need good blood flow to work, so poorer circulation can show up as tiring more easily than you used to.
The risk factors that matter most
Most of what drives heart and blood vessel disease is well understood. The main risk factors are high blood pressure, high LDL cholesterol, smoking, diabetes, being physically inactive, carrying excess weight around the middle, and heavy drinking. Age, sex and family history matter too, even though you can't change them.
These factors add up. Moderately raised blood pressure plus slightly high cholesterol plus a family history can mean more overall risk than one very high number on its own. That's why doctors increasingly look at your combined risk rather than each result separately. Fat stored around the abdomen is part of this picture, which our article on why your waist measurement matters explains.
What a heart health check involves
In Australia, adults are generally encouraged to have their blood pressure checked regularly, and a more complete heart health check is recommended from middle age, and earlier for Aboriginal and Torres Strait Islander people and those with certain risk factors.
A heart health check usually brings together your blood pressure, a cholesterol test, a blood sugar test, your smoking history, your waist or weight, and your family history. A doctor then uses a risk calculator to estimate your chance of a heart attack or stroke over the next five years. That estimate guides what happens next, from simple lifestyle changes to closer monitoring. Our guide to metabolic blood tests covers the blood tests involved.
Everyday habits that support your circulation
The foundations are unglamorous but well established. Regular movement that gets you a bit puffed, not smoking, eating plenty of vegetables, fruit, whole grains, legumes and nuts, keeping salt and alcohol down, and getting enough sleep all support healthy blood vessels. None of these replace a proper assessment, but they matter at every age.
When to talk to a doctor
Book a check-up if you haven't had your blood pressure or cholesterol checked in the last couple of years, if you have a family history of heart disease or stroke, or if you smoke, have diabetes or carry extra weight around the middle. See a doctor promptly if you notice breathlessness or chest discomfort with exertion, leg pain when walking, swelling in your ankles or palpitations. Signs of stroke, such as a drooping face, arm weakness or slurred speech, need a call to 000 straight away. If you have chest pain, trouble breathing or feel faint, call 000.
How UHD BioHealth can help
UHD BioHealth is a doctor-led telehealth service available across Australia. You start with a detailed online questionnaire, and an AHPRA-registered doctor reviews it within 24 hours. Where it's useful, your doctor will recommend bloodwork you can do locally, then you receive a written, personalised plan with every cost listed before you pay anything, checked by a second, independent doctor, with follow-up care along the way. See what a doctor looks at for healthy ageing.
Common questions
At what age should I start thinking about heart health?
Earlier than most people do. The changes in blood vessels that lead to heart attack and stroke can start in early adulthood and build slowly without symptoms. Regular blood pressure checks through adulthood, and a fuller heart health check from middle age, are a sensible baseline.
Can you have heart disease without symptoms?
Yes. Plaque can build up in the arteries for years without causing any symptoms, and high blood pressure and high cholesterol usually can't be felt at all. That's why checking risk factors matters more than waiting for warning signs.
Is heart disease mainly a men's health issue?
No. Heart disease and stroke are major causes of death for both men and women in Australia. Symptoms in women can be less typical, such as unusual tiredness, breathlessness, nausea or discomfort in the jaw, neck or back, so they're sometimes missed.
Planning for the long game
An in-depth health questionnaire covering your history, symptoms, medications and lifestyle, read by an AHPRA-registered doctor within 24 hours. Bloodwork where it's needed, and a written plan before you pay anything.
General health information only, not medical advice. Complete our questionnaire and a doctor will assess whether a consult is right for you. Individual needs and outcomes vary. In an emergency, call 000.
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