Why Do People Get Heart Disease?
Why Do People Get Heart Disease? — Uncovering the Hidden “Killers” of Heart Health
The heart, as the “engine” of the human circulatory system, pumps blood to the entire body day and night. However, this “engine” is not indestructible. With age and changes in lifestyle, various factors can cause abnormalities in cardiac structure or function, ultimately leading to heart disease. Clinically, the causes of heart disease are complex and diverse, mainly divided into modifiable factors and non-modifiable factors. Understanding these triggers can help us better protect our heart health.
I. Modifiable Factors: Lifestyle and Acquired Habits as Major “Trigger Points”
These factors account for more than 70% of the causes of heart disease. By scientifically adjusting lifestyle, the risk of illness can be effectively reduced, making them the core targets for heart disease prevention.
- The “Three Highs”: Chronic “Poison” for Blood Vessels
Hypertension, hyperlipidemia, and hyperglycemia are the “number one culprits” of heart disease. Hypertension continuously impacts blood vessel walls over the long term, leading to coronary arteriosclerosis and myocardial hypertrophy—like constantly “pressurizing” blood vessels, ultimately causing coronary heart disease and heart failure. Hyperlipidemia causes cholesterol, triglycerides, and other substances in the blood to deposit on the inner walls of blood vessels, forming atherosclerotic plaques that narrow and harden the vessels. If a plaque ruptures, it can induce myocardial infarction. Hyperglycemia (especially in diabetic patients) damages blood vessels and nerves throughout the body, reducing vascular elasticity and increasing blood viscosity, significantly raising the risk of coronary heart disease and cardiomyopathy. Moreover, the disease progresses faster after onset.
- Unhealthy Diet: A “Diet-Induced” Burden on the Heart
Long-term consumption of high-oil, high-salt, and high-sugar foods is an important trigger for heart disease. A high-salt diet causes water and sodium retention, increasing blood pressure. Trans fats and saturated fats (commonly found in fried foods, fatty meats, and processed meats) directly raise “bad cholesterol” and accelerate atherosclerosis. Excessive sugar intake induces obesity and insulin resistance, indirectly increasing the heart’s burden. Conversely, a diet lacking vegetables, fruits, whole grains, and high-quality protein reduces the “protective power” of blood vessels due to insufficient dietary fiber and unsaturated fatty acids.
- Smoking and Excessive Alcohol Consumption: Direct “Harmers” of the Heart
Smoking is a confirmed risk factor for heart disease. Harmful substances such as nicotine and carbon monoxide in tobacco stimulate blood vessel constriction, damage the vascular endothelium, accelerate plaque formation, increase blood viscosity, and induce blood clots. Data shows that smokers are 2-4 times more likely to develop coronary heart disease than non-smokers. Secondhand smoke and thirdhand smoke also threaten the heart health of others. Excessive alcohol consumption raises blood pressure, damages myocardial cells, causes alcoholic cardiomyopathy, and may lead to arrhythmias (such as atrial fibrillation), increasing the risk of stroke and heart failure.
- Lack of Exercise and Obesity: Extra “Burdens” on the Heart
Regular exercise improves cardiovascular function and lowers blood pressure and blood lipids. However, the sedentary lifestyle of modern people slows blood circulation, disrupts metabolism, and increases the risk of heart disease. Obesity (especially abdominal obesity) directly increases the heart’s pumping burden and is accompanied by insulin resistance, hyperlipidemia, and other issues, forming a vicious cycle of “obesity-heart disease.” Studies have shown that for every 1-point increase in body mass index (BMI), the risk of coronary heart disease rises accordingly.
II. Non-Modifiable Factors: “Natural Risks” from Birth and Age
These factors cannot be changed, but they help us recognize risks earlier and take preventive measures in advance.
- Age and Gender: Physiological Changes Brought by Time
With age, the elasticity of human blood vessels naturally decreases, and the incidence of atherosclerosis gradually increases. Therefore, middle-aged and elderly people (males ≥45 years old, females ≥55 years old) are high-risk groups for heart disease. In terms of gender, men have a much higher risk of heart disease than women, which may be related to androgens in men that promote vascular damage. After menopause, women’s estrogen levels drop, losing their protective effect on blood vessels, and the risk of illness quickly approaches that of men.
- Genetic Factors: “Risk Genes” Passed Down in Families
If an immediate family member (parent, sibling) has heart disease such as coronary heart disease or myocardial infarction at a young age (males old, females years old), the individual’s risk of illness increases significantly. This may be related to vascular dysfunction and abnormal lipid metabolism caused by genetic genes, but it does not mean “being born with heart disease.” The risk can still be effectively reduced through acquired interventions.
- Congenital Heart Defects: Inborn Structural Issues
Some people are born with structural heart defects (such as atrial septal defect, ventricular septal defect, tetralogy of Fallot) due to abnormal embryonic development. Such congenital heart diseases may show symptoms in childhood, while some patients are not diagnosed until adulthood, requiring surgical or interventional treatment for repair.
III. Other Triggering Factors: Easily Overlooked “Invisible Promoters”
In addition to the above two categories, some long-term adverse conditions may also indirectly induce heart disease:
- Chronic Mental Stress and Anxiety: Persistent stress causes increased secretion of adrenaline and cortisol in the body, leading to elevated blood pressure and heart rate. Over time, it can damage the vascular endothelium and increase the risk of heart disease.
- Sleep Deprivation or Sleep Apnea: Staying up late and insomnia disrupt the heart rhythm, while obstructive sleep apnea syndrome causes nighttime hypoxia, raises blood pressure, and induces arrhythmias and coronary heart disease.
- Impact of Certain Diseases: Conditions such as hyperthyroidism, chronic kidney disease, and rheumatic fever may indirectly cause heart disease by affecting cardiac function, damaging the myocardium, or impairing blood vessels.
Summary: Heart Disease is the Result of “Multiple Factors Acting Together”
In fact, most heart diseases are not caused by a single factor but by the “superimposed effect” of innate risks and acquired habits. For example, people with a family history of heart disease who also smoke, are obese, or have the “three highs” face a geometric increase in disease risk. Even without a genetic background, maintaining an unhealthy lifestyle for a long time can overload the heart.
Fortunately, 80% of heart diseases can be prevented. Controlling the “three highs,” quitting smoking and limiting alcohol, maintaining a balanced diet, exercising regularly, managing weight, regulating emotions, and ensuring adequate sleep—these seemingly simple habits are the “key codes” to protecting heart health. Especially high-risk groups such as people over 40 years old, those with a family history of heart disease, and patients with the “three highs” should undergo regular cardiac examinations (such as electrocardiogram, echocardiogram, blood lipid, and blood glucose tests) to detect and intervene early, allowing the heart “engine” to operate smoothly and continuously.
