Heart Disease: Symptoms, Causes, Types, and Treatment
Heart disease is the leading cause of death in the United States and worldwide. Understanding its types, warning signs, and risk factors is the first step toward prevention and effective management.
Written by
Dr. Sarah Chen, MD
Preventive Medicine
Medically reviewed by
Dr. Maria Fernandez, MD
Board-Certified Cardiologist
Key Takeaways
- Heart disease is the #1 cause of death globally — but 80% of cases are preventable
- High blood pressure, high cholesterol, and smoking are the top three modifiable risk factors
- Women often experience different heart attack symptoms than men
- The earlier heart disease is detected, the more treatment options are available
- A heart-healthy diet and regular exercise can significantly reduce your risk
In This Article
What Is Heart Disease?
Heart disease is a broad term describing a range of conditions affecting your heart's structure and function. The most common type is coronary artery disease (CAD), which involves the narrowing or blocking of the coronary arteries — the blood vessels that supply the heart with oxygen-rich blood. When these arteries are narrowed, blood flow to the heart is reduced, which can cause chest pain (angina) or a heart attack. Heart disease remains the leading cause of death in the United States, accounting for approximately 1 in 4 deaths each year. In 2026, an estimated 17.9 million people worldwide die from cardiovascular diseases annually.
Types of Heart Disease
Heart disease encompasses several distinct conditions. Coronary artery disease (CAD) develops when plaque builds up in artery walls. Arrhythmias involve abnormal heart rhythms — the heart may beat too fast, too slowly, or irregularly. Heart failure occurs when the heart can no longer pump enough blood to meet the body's needs. Valvular heart disease affects the valves controlling blood flow. Congenital heart defects are structural abnormalities present at birth. Each type requires specific diagnostic approaches and treatment strategies tailored to the individual patient.
Warning Signs and Symptoms
Symptoms of heart disease vary depending on the type but commonly include chest pain or discomfort (angina), shortness of breath, fatigue, irregular heartbeat, and swelling in the legs, ankles, or feet. In women, symptoms may be less obvious and can include nausea, jaw pain, or back pain rather than the classic chest pain associated with heart attacks. Many people experience no symptoms at all until a heart attack or stroke occurs — which is why regular health screenings are so critical, especially if you have known risk factors for cardiovascular disease.
Risk Factors You Can Control
Many risk factors increase your chance of developing heart disease, and the good news is that most are modifiable through lifestyle change. Controllable risk factors include high blood pressure (hypertension), high LDL cholesterol, smoking, obesity, physical inactivity, type 2 diabetes, poor diet high in saturated fats and sodium, and excessive alcohol consumption. Research consistently shows that addressing even one or two of these factors can significantly reduce cardiovascular risk. A comprehensive lifestyle intervention combining diet, exercise, and stress management has been shown to partially reverse coronary artery disease in clinical trials.
Diagnosis
Diagnosing heart disease involves a combination of medical history review, physical examination, and diagnostic tests. Common tests include an electrocardiogram (ECG) to record electrical activity, echocardiogram (heart ultrasound) to visualize heart structure, stress tests to observe function during exercise, blood tests to check cholesterol, blood sugar, and cardiac markers like troponin, coronary angiography to visualize artery blockages, and advanced imaging like cardiac CT or MRI for detailed assessment. Your doctor will recommend the appropriate tests based on your symptoms, risk profile, and clinical presentation.
Treatment and Prevention
Treatment depends on the type and severity of heart disease. Lifestyle changes are almost always the foundation: eating a heart-healthy diet rich in vegetables, fruits, whole grains, and lean proteins; exercising at least 150 minutes per week; quitting smoking; managing stress; and maintaining a healthy weight. Medications may include statins to lower cholesterol, ACE inhibitors or ARBs for blood pressure, beta-blockers to reduce heart rate and workload, antiplatelet drugs like aspirin to prevent clots, and diuretics for fluid retention. Surgical options include coronary angioplasty and stenting, coronary artery bypass graft (CABG) surgery, valve repair or replacement, and implantable devices like pacemakers or defibrillators.
