Quick answer: coronary heart disease is the build-up of fatty plaque in the arteries that supply the heart muscle — not a condition caused by high blood pressure, though hypertension accelerates it. The most dangerous myths are that it is a man’s disease, that young people are exempt, that no symptoms means no disease, and that a normal cholesterol number makes you safe. All four are wrong, and each one delays diagnosis. The warning signs are below; read those first.
Warning Signs: Call Emergency Services
Before the myths, the part that matters most.
- Chest pain, pressure, tightness or heaviness lasting more than a few minutes, or going away and coming back
- Discomfort spreading to one or both arms, the jaw, neck, back or stomach
- Shortness of breath, with or without chest discomfort
- Cold sweat, nausea or vomiting, or light-headedness
- Sudden unexplained exhaustion, particularly in women
Call an ambulance rather than driving. Crews start treatment on the way and can defibrillate. Most delay in heart attack comes from people waiting to see whether it passes.
The Hollywood heart attack is misleading. Many are not dramatic — no clutching the chest, no collapse. They can feel like indigestion, a heavy ache, or simply feeling profoundly unwell. Women, people over 75 and people with diabetes are more likely to present this way, and more likely to be missed.
What Coronary Heart Disease Actually Is
The heart muscle has its own dedicated blood supply, carried by the coronary arteries on the surface of the heart. Over years, fatty deposits called plaque accumulate in their walls — a process called atherosclerosis — narrowing and stiffening them.
Two consequences follow. When a narrowed artery cannot deliver enough blood during exertion, you get angina. And if a plaque ruptures, a clot can form and block the artery entirely, causing a heart attack, in which heart muscle begins to die.
It is also called coronary artery disease or ischemic heart disease, and it remains the leading cause of death worldwide.
Two clarifications, since both are commonly muddled:
- High blood pressure does not cause it directly. Hypertension damages artery walls and accelerates plaque build-up, making it a major risk factor — but the disease itself is the plaque.
- Coronary heart disease and stroke are not the same. CHD affects the arteries supplying the heart; stroke involves the blood supply to the brain. They share risk factors and often occur in the same person, but they are distinct events.
The Myths That Cause Real Harm
Myth 1: It is a man’s disease
Heart disease is the leading cause of death in women as well as men. Women tend to develop it later, which creates a false sense of exemption in middle age, and are more likely to present atypically — with breathlessness, fatigue, nausea or jaw and back discomfort rather than classic chest pain.
This is the myth with the clearest documented consequence: women are less likely to be investigated promptly, less likely to receive guideline treatment, and have historically been under-represented in cardiovascular trials. If you are a woman with unexplained breathlessness or exhaustion and cardiac risk factors, say the word “heart” to your doctor.
Myth 2: You are too young
Atherosclerosis begins decades before symptoms. Fatty streaks in arteries have been found in adolescents and young adults in autopsy studies. Heart attacks in people in their 30s and 40s are not rare, and rates in younger adults have not improved in line with older groups.
Familial hypercholesterolaemia — an inherited condition causing very high cholesterol from birth — affects roughly 1 in 250 people and is substantially underdiagnosed. If close relatives had heart attacks before 55 in men or 65 in women, that is worth raising specifically.
Myth 3: No symptoms means no disease
The most dangerous one. Coronary disease develops silently over years, and for a substantial proportion of people the first sign is a heart attack or sudden cardiac death. High blood pressure and high cholesterol produce no sensations at all, which is why both are found through testing rather than symptoms.
The practical response is not worry but measurement: know your blood pressure, your cholesterol and your blood glucose numbers rather than waiting to feel something.
Myth 4: Normal cholesterol means you are safe
A large share of heart attacks occur in people whose LDL cholesterol was within the normal range. Risk is multifactorial — blood pressure, smoking, diabetes, family history, age, inflammation and other lipid measures all contribute.
This is why clinicians use overall risk calculators rather than any single number, and why “normal” is not the same as optimal, particularly if you already have other risk factors.
Myth 5: After years of smoking, quitting will not help
Wrong, and this myth costs lives. Cardiovascular risk begins falling within the first year of stopping and continues to fall for years afterwards, eventually approaching that of people who never smoked. Stopping smoking is the single largest and fastest risk reduction available to most people with coronary disease — larger than any medication.
Myth 6: Cut all fat from your diet
The type matters more than the total. Saturated fat and trans fat raise LDL cholesterol; unsaturated fats from olive oil, rapeseed oil, nuts, seeds and oily fish do not, and replacing saturated with unsaturated fat improves cardiovascular outcomes.
Very low-fat diets that swap fat for refined carbohydrate do not help. Our heart-healthy eating guide covers the DASH and Mediterranean patterns in detail.
Myth 7: A stent cures it
A stent opens one narrowed segment. It does not remove atherosclerosis from the rest of your arteries, and in stable coronary disease large trials have found stenting does not reduce the risk of death or heart attack compared with good medical therapy — though it does relieve angina. The situation is entirely different during an acute heart attack, where opening the artery urgently is life-saving.
See stable ischemic heart disease for what the trials found and the questions worth asking.
Myth 8: Exercise is dangerous once you have heart disease
The opposite is generally true. Regular activity, and cardiac rehabilitation in particular, improves symptoms, fitness, quality of life and outcomes. The programme should be agreed with your cardiologist, but the default is to move more, not less.
Myth 9: Family history makes it inevitable
Family history raises risk and cannot be changed, but it does not determine the outcome. In people at high genetic risk, a favourable lifestyle has been associated with a substantially lower rate of coronary events. A strong family history is a reason to start managing risk factors earlier, not a reason to give up.
Myth 10: Supplements will protect you
Fish oil, vitamin E, multivitamins and antioxidant supplements have generally not shown the cardiovascular protection once hoped for in large randomised trials. Eating oily fish has better support than taking the capsule. Never substitute a supplement for prescribed treatment, and tell your doctor what you take, since some interact with cardiac medication.
Risk Factors: What You Can and Cannot Change
| Modifiable | Not modifiable |
|---|---|
| Smoking, including vaping and secondhand smoke | Age |
| High blood pressure | Sex |
| High LDL cholesterol | Family history of premature heart disease |
| Diabetes and prediabetes | Ethnicity, which affects baseline risk in some groups |
| Physical inactivity | Inherited conditions such as familial hypercholesterolaemia |
| Excess weight, particularly around the abdomen | |
| Poor diet, high in saturated fat, salt and refined carbohydrate | |
| Excess alcohol | |
| Chronic stress and poor sleep, including untreated sleep apnoea |
The encouraging part: the great majority of the risk sits in the left-hand column. A large international study of heart attack risk found that a small set of largely modifiable factors accounted for the overwhelming majority of population risk, consistently across regions and ethnic groups.
What Actually Reduces Your Risk
- Stop smoking. Nothing else on this list delivers as much, as fast.
- Know your numbers. Blood pressure, LDL cholesterol, HbA1c. You cannot manage what you have never measured.
- Move regularly. 150 to 300 minutes of moderate activity weekly, plus strength work twice a week.
- Eat a DASH or Mediterranean pattern, and reduce sodium — most of which comes from processed and restaurant food rather than the salt shaker.
- Take prescribed medication. Statins and blood pressure treatment do not make you feel different, which is exactly why people stop them. That is a mistake.
- Treat sleep apnoea if you snore heavily, stop breathing at night or wake unrefreshed. It is common and frequently undiagnosed.
- Attend cardiac rehabilitation if eligible. Strong evidence, widely under-used.
See our heart disease prevention guide for more detail.
Frequently Asked Questions
It is the build-up of fatty plaque in the coronary arteries that supply the heart muscle, a process called atherosclerosis. Narrowed arteries cannot deliver enough blood during exertion, which causes angina, and if a plaque ruptures a clot can block the artery completely, causing a heart attack. It is also called coronary artery disease or ischemic heart disease, and it remains the leading cause of death worldwide.
Not directly. The disease itself is plaque build-up in the coronary arteries. High blood pressure damages artery walls and accelerates that process, making it a major risk factor, but the two are not the same thing. Coronary heart disease is also distinct from stroke, which involves the blood supply to the brain rather than the heart, though they share risk factors.
That having no symptoms means having no disease. Coronary disease develops silently over years, and for a substantial proportion of people the first sign is a heart attack or sudden cardiac death. High blood pressure and high cholesterol produce no sensations at all. The practical response is to know your blood pressure, cholesterol and blood glucose numbers rather than waiting to feel something wrong.
No. Heart disease is the leading cause of death in women as well as men. Women tend to develop it later, which creates a false sense of exemption in middle age, and are more likely to present atypically with breathlessness, fatigue, nausea or jaw and back discomfort rather than classic chest pain. Women are also less likely to be investigated promptly and to receive guideline treatment, which makes this myth actively harmful.
Yes. Atherosclerosis begins decades before symptoms, and fatty streaks have been found in the arteries of adolescents and young adults. Heart attacks in people in their 30s and 40s are not rare. Familial hypercholesterolaemia, an inherited condition causing very high cholesterol from birth, affects roughly 1 in 250 people and is substantially underdiagnosed — worth raising if close relatives had heart attacks before 55 in men or 65 in women.
No. A large share of heart attacks occur in people whose LDL cholesterol was within the normal range. Risk is multifactorial — blood pressure, smoking, diabetes, family history, age and inflammation all contribute — which is why clinicians use overall risk calculators rather than any single number. Normal is also not the same as optimal, particularly if you already have other risk factors.
No, and this myth costs lives. Cardiovascular risk begins falling within the first year of stopping and continues to fall for years afterwards, eventually approaching that of people who never smoked. Stopping smoking is the single largest and fastest risk reduction available to most people with coronary disease — larger than any medication.
No. Family history raises risk and cannot be changed, but it does not determine the outcome — in people at high genetic risk, a favourable lifestyle has been associated with a substantially lower rate of coronary events. A strong family history is a reason to start managing blood pressure, cholesterol and other risk factors earlier than you otherwise would, not a reason to assume the result is fixed.
Sources
- National Heart, Lung, and Blood Institute — Coronary Heart Disease.
- World Health Organization — Cardiovascular diseases fact sheet.
- MedlinePlus — Coronary Artery Disease.
- Centers for Disease Control and Prevention — Heart attack symptoms, risk and recovery.
- NHS — Coronary heart disease.
- NHLBI — Cardiac Rehabilitation.
- CDC — Smoking, heart disease and stroke.
Last updated: August 2026. Written by Maja Zayeri, who covers cardiovascular topics and is not a clinician. Reviewed for accuracy by our editorial team; not reviewed by a named clinician. This article is general information and is not medical advice or a diagnosis. Cardiovascular risk is individual, and decisions about testing, medication and procedures belong with your doctor. If you have symptoms suggesting a heart attack, call emergency services immediately rather than reading further.
