Heart attacks are usually portrayed as dramatic events. On television we see people clutching their chest and collapsing in agony. That mental image is embedded in our culture — but it represents only a fraction of the reality.
A heart attack (myocardial infarction) happens when blood flow to part of the heart muscle is suddenly blocked, usually by a clot. Classic symptoms include chest pain or pressure, pain spreading to the arm, jaw or neck, breathlessness, dizziness, sweating and fatigue. But in a significant number of cases, symptoms are mild, atypical, or never noticed at all. The person does not seek help, and the heart attack goes unrecognised — sometimes only discovered months or years later on a routine ECG.
These are known as silent heart attacks, and while they cause less disturbance at the time, they are no less damaging. Blood flow is still interrupted, heart muscle still dies, and scar tissue still forms. Having a silent heart attack also significantly increases the risk of a further, potentially fatal one.
How common are they?
A study following around 2,000 people aged 44–85 with no known cardiovascular disease found that after 10 years, roughly 12% had developed myocardial scarring — evidence that a heart attack had occurred. Strikingly, about 80% of those people had no idea it had happened.
Research referenced by the British Heart Foundation has also found silent heart attacks to be more common in women, who may experience different or less intense symptoms and are therefore less likely to recognise what is happening.
Symptoms that get dismissed
Silent heart attacks are rarely completely symptomless — more often the symptoms are misattributed. Watch for:
- Unusual, unexplained fatigue lasting days
- Mild chest discomfort mistaken for indigestion or heartburn
- Breathlessness on ordinary activity, such as climbing stairs
- Pain or aching in the jaw, neck, back, shoulders or either arm
- Nausea, cold sweats or light-headedness
- A general sense of being unwell, without an obvious cause
Women, older adults and people with diabetes (whose nerve function may be affected) are especially likely to present this way.
Know your risk factors
The risk factors for a silent heart attack are the same as for any heart attack:
- Age — most people who have a heart attack are 55 or older
- Sex — men are at greater risk and tend to have attacks earlier in life, though women's risk rises sharply after the menopause
- Family history — a close relative with early cardiovascular disease raises your risk. You cannot change this, but knowing it should prompt you to manage everything else more closely
- Smoking — damages the artery lining, reduces oxygen in the blood, and raises blood pressure and heart rate
- Physical inactivity — regular moderate activity lowers risk and helps control cholesterol, blood sugar and weight
- High blood pressure — thickens and stiffens the heart muscle over time
- High cholesterol — contributes to fatty plaque build-up that narrows the arteries
- Diabetes and pre-diabetes — both accelerate arterial damage
When to seek help
Call 999 immediately if you have chest pain or pressure lasting more than 15 minutes, especially with breathlessness, sweating, nausea, or pain spreading to the arm, jaw or back. Do not drive yourself.
If you suspect you may have dismissed something in the past, book an appointment with your GP. An assessment of your symptoms, risk profile, family history and an ECG can determine whether further tests are needed.
Prevention
Most of what protects your heart is unglamorous and effective: stop smoking, move regularly, keep blood pressure and cholesterol in range, limit alcohol, prioritise sleep, and eat a diet built on vegetables, wholegrains, pulses, oily fish and nuts rather than processed foods and saturated fat. Because silent heart attacks give so little warning, regular monitoring matters more here than almost anywhere else in medicine.
Checking your cardiovascular risk
Rightangled offers home blood tests covering cholesterol, HbA1c and other cardiovascular markers, and DNA tests that assess inherited risk. Results are reviewed by our clinical team, which includes GPhC-registered independent prescribers, with medical oversight from our doctor, Dr Abdullah, so you get personalised guidance rather than raw numbers.
Verify us with the General Pharmaceutical Council (registration 9011933), see our LegitScript certification, and read reviews on Trustpilot.
This article is for general information and does not replace personalised medical advice. If you think you may be having a heart attack, call 999.
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