Atherosclerosis Types, Causes, Symptoms, Diagnosis, and Treatments

Abstract

Atherosclerosis is a condition in which fatty deposits build up in the walls of arteries, causing them to narrow and harden. This restricts blood flow and increases the risk of serious cardiovascular problems such as heart attacks, strokes, and peripheral artery disease. The condition develops gradually over time and is often linked to lifestyle factors, genetics, and underlying medical conditions. This article provides a comprehensive guide to atherosclerosis, explaining its causes, symptoms, diagnosis, treatment, and long-term management in simple and accessible language.

Cite as: Atherosclerosis: Types, Causes, Symptoms, and Treatments. Brisbane (AU): Exon Publications; 2025. Published on  19 Mar. DOI: https://doi.org/10.36255/atherosclerosis-types-causes-symptoms-diagnosis-treatments

Introduction

The circulatory system relies on healthy arteries to transport oxygen-rich blood to the body’s organs and tissues. When these arteries become narrowed or blocked due to the buildup of plaque, it can lead to serious health complications. Atherosclerosis is a leading cause of cardiovascular disease and can affect different parts of the body. Many people do not realize they have atherosclerosis until a major event such as a heart attack or stroke occurs. Recognizing risk factors, symptoms, and treatment options can help individuals take control of their heart health and reduce the likelihood of life-threatening complications (1-3).

Atherosclerosis is a condition characterized by the buildup of plaque inside the arteries. Plaque is made up of cholesterol, fat, calcium, and other substances found in the blood. Over time, this accumulation can cause the arteries to become stiff and narrow, making it harder for blood to flow through them. Image: Atherosclerosis concept with plaques in the artery. Image Credit: PhonlamaiPhoto's Images via Canva.com

What is Atherosclerosis?

Atherosclerosis is a condition characterized by the buildup of plaque inside the arteries. Plaque is made up of cholesterol, fat, calcium, and other substances found in the blood. Over time, this accumulation can cause the arteries to become stiff and narrow, making it harder for blood to flow through them. If a plaque deposit ruptures, it can lead to the formation of blood clots, which can block blood flow entirely. This can result in severe cardiovascular conditions such as heart attacks and strokes. Genetic factors, including variations in the APOE and PCSK9 genes, may influence an individual’s risk of developing atherosclerosis.

Types of Atherosclerotic Plaques

There are different types of plaques, each with distinct characteristics that influence their behavior and potential for complications.

Stable Plaques

Stable plaques have a thick fibrous cap and a lower concentration of lipids, making them less likely to rupture. They cause gradual narrowing of the arteries, leading to conditions such as angina (chest pain) and peripheral artery disease. While stable plaques can reduce blood flow, they tend to remain intact and do not immediately trigger heart attacks or strokes. Treatment focuses on controlling risk factors through lifestyle changes, cholesterol-lowering medications like statins, and blood pressure management.

Unstable or Vulnerable Plaques

Unstable plaques have a thin fibrous cap and a large lipid core, making them more prone to rupture. When an unstable plaque breaks open, it triggers the formation of blood clots (thrombosis), which can suddenly block blood flow and cause heart attacks or strokes. These plaques may not always cause symptoms before rupturing, making them particularly dangerous. Managing cholesterol, reducing inflammation, and taking blood-thinning medications can help stabilize these plaques and lower the risk of complications.

Calcified Plaques

Calcified plaques contain high levels of calcium deposits, making them stiff and inflexible. These plaques contribute to arterial hardening (arteriosclerosis), reducing the elasticity of blood vessels and increasing blood pressure. Calcified plaques are often detected through imaging tests such as coronary artery calcium (CAC) scoring, which helps assess cardiovascular risk. Treatment typically involves blood pressure control, cholesterol management, and lifestyle modifications to prevent further arterial damage.

Fibrous Plaques

Fibrous plaques are made up of collagen, smooth muscle cells, and a small amount of lipids, forming a dense and structured deposit. These plaques partially block blood flow but are less likely to rupture compared to unstable plaques. Over time, they can contribute to chronic cardiovascular conditions such as angina and high blood pressure. While fibrous plaques are considered relatively stable, ongoing monitoring, cholesterol control, and medication can help prevent progression and complications.

Fatty Streaks

Fatty streaks are the earliest form of atherosclerotic plaque, consisting of lipid-filled immune cells called foam cells. These streaks develop in childhood or early adulthood and may progress into more advanced plaques over time. Although fatty streaks do not immediately block blood flow, they indicate an increased risk of atherosclerosis. Adopting a healthy diet, regular exercise, and avoiding smoking can help prevent fatty streaks from developing into more dangerous plaques.

Types of Atherosclerosis-Related Diseases

There are no distinct "types of atherosclerosis," but the condition is classified based on the arteries where plaque buildup occurs. The disease is usually named after the affected artery and the specific health condition it causes. As a result, atherosclerosis can lead to different diseases depending on which part of the body is impacted. Below are some common atherosclerosis-related diseases and their effects on various organs and systems.

Coronary Artery Disease (CAD)

Coronary artery disease occurs when atherosclerosis affects the arteries that supply blood to the heart. Over time, plaque buildup narrows these arteries, reducing blood flow to the heart muscle. This can cause chest pain (angina), shortness of breath, and an increased risk of heart attacks. CAD is one of the leading causes of death worldwide. Risk factors include high cholesterol, high blood pressure, smoking, diabetes, and a sedentary lifestyle. Treatment includes lifestyle changes, medications like statins and beta-blockers, and procedures such as angioplasty or bypass surgery.

Peripheral Artery Disease (PAD)

Peripheral artery disease occurs when atherosclerosis affects the arteries that supply blood to the limbs, usually the legs. Reduced blood flow can cause leg pain, cramping, numbness, and slow-healing wounds. Severe cases may lead to tissue damage, gangrene, and the need for amputation. PAD is often linked to diabetes, smoking, and high cholesterol. Treatment includes medications to improve circulation, supervised exercise therapy, and surgical interventions like angioplasty or bypass grafting.

Carotid Artery Disease

Carotid artery disease occurs when atherosclerosis affects the carotid arteries, which supply blood to the brain. Plaque buildup can lead to stroke or transient ischemic attacks (mini-strokes) by reducing blood flow or causing a blood clot. Symptoms may include sudden weakness, difficulty speaking, vision loss, and facial drooping. Risk factors include hypertension, smoking, and high cholesterol. Treatment options range from medications like blood thinners to surgical procedures such as carotid endarterectomy or stent placement.

Renal Artery Disease

Renal artery disease occurs when atherosclerosis affects the arteries that supply blood to the kidneys. This can cause high blood pressure, kidney dysfunction, and an increased risk of kidney failure. Symptoms may not appear in the early stages, but as the condition worsens, swelling in the legs, uncontrolled blood pressure, and reduced kidney function may develop. Treatment includes blood pressure management, cholesterol-lowering drugs, and procedures like angioplasty or stenting to restore proper blood flow.

Aneurysms

Aneurysms occur when atherosclerosis weakens the arterial walls, causing them to bulge or balloon out. If an aneurysm ruptures, it can lead to life-threatening internal bleeding. Aneurysms can develop in the aorta (abdominal aortic aneurysm), brain (cerebral aneurysm), and other major arteries. Many aneurysms do not cause symptoms until they grow large or rupture. Risk factors include high blood pressure, smoking, and family history. Treatment may involve regular monitoring, blood pressure control, and surgery to repair or reinforce the artery wall.

Vertebral Artery Disease

Vertebral artery disease occurs when atherosclerosis affects the vertebral arteries, which supply blood to the brainstem and posterior parts of the brain. Narrowing of these arteries can lead to dizziness, balance problems, vision disturbances, and an increased risk of stroke. This condition is often associated with hypertension, smoking, and high cholesterol. Treatment includes lifestyle modifications, medications like antiplatelet drugs, and in severe cases, stenting or surgical intervention.

Mesenteric Artery Ischemia

Mesenteric artery ischemia occurs when atherosclerosis affects the arteries supplying blood to the intestines. Reduced blood flow to the intestines can cause severe abdominal pain, weight loss, nausea, and digestive issues. Chronic mesenteric ischemia can lead to malnutrition and intestinal failure, while acute cases may result in life-threatening bowel infarction (dead tissue in the intestines). Treatment includes blood thinners, angioplasty, or surgical bypass to restore blood flow.

Risk Factors and Causes of Atherosclerosis

Several factors contribute to the development of atherosclerosis. High cholesterol levels increase the buildup of plaque in the arteries, while high blood pressure damages the artery walls, making them more susceptible to plaque formation. Smoking is a major risk factor because it contributes to arterial damage and inflammation. Unhealthy diets that are high in saturated fats and processed foods contribute to increased cholesterol levels. Lack of physical activity weakens the cardiovascular system and increases the likelihood of plaque accumulation. Genetic predisposition also plays a role, with specific genes, such as LDLR and APOB, influencing cholesterol metabolism and atherosclerosis risk.

Symptoms of Atherosclerosis

Atherosclerosis often develops silently, without noticeable symptoms, until an artery becomes significantly narrowed or blocked. When symptoms do appear, they vary depending on the affected artery. In coronary artery disease, symptoms may include chest pain, shortness of breath, and fatigue. Carotid artery disease may cause dizziness, weakness, or sudden vision problems. Peripheral artery disease can lead to leg pain, cramps, and difficulty walking. Severe cases of atherosclerosis may result in heart attacks or strokes, which require immediate medical attention. Recognizing early warning signs and seeking medical evaluation can help prevent severe complications.

Pathophysiology of Atherosclerosis

Atherosclerosis begins when the inner lining of the arteries, known as the endothelium, becomes damaged due to factors such as high cholesterol, high blood pressure, or smoking. This damage triggers an immune response, leading to the accumulation of fatty deposits and inflammatory cells in the artery walls. Over time, these deposits harden and form plaques that narrow the arteries. As the plaques grow, they reduce blood flow and increase the risk of blood clots forming. If a plaque ruptures, it can cause a sudden blockage, leading to heart attacks or strokes. The process of atherosclerosis is gradual.

Diagnosis of Atherosclerosis

Diagnosing atherosclerosis involves a combination of medical history evaluation, physical examinations, and diagnostic tests. Blood tests are used to measure cholesterol and triglyceride levels, which help assess cardiovascular risk. Imaging tests such as ultrasound, computed tomography (CT) scans, and magnetic resonance angiography (MRA) provide detailed images of blood vessels to detect plaque buildup. An electrocardiogram (ECG) evaluates heart function, while stress tests assess how the heart responds to physical activity. In some cases, an angiogram may be performed to visualize blockages in the arteries using contrast dye and X-ray imaging.

Complications of Atherosclerosis

If left untreated, atherosclerosis can lead to life-threatening complications. Heart attacks occur when blood flow to the heart is blocked by a ruptured plaque or clot. Strokes result from reduced blood flow to the brain due to narrowed or blocked carotid arteries. Peripheral artery disease can cause severe pain, poor circulation, and an increased risk of infections or amputations. Chronic kidney disease may develop if atherosclerosis affects the arteries supplying blood to the kidneys. The long-term impact of atherosclerosis highlights the importance of prevention, early detection, and effective management.

Treatment and Management of Atherosclerosis

Managing atherosclerosis involves lifestyle changes, medications, and medical procedures. Adopting a heart-healthy diet that includes fruits, vegetables, whole grains, and lean proteins helps lower cholesterol and reduce plaque buildup. Regular physical activity improves circulation and supports cardiovascular health. Medications such as statins, including atorvastatin (Lipitor) and rosuvastatin (Crestor), help lower cholesterol levels. Blood pressure medications such as amlodipine (Norvasc) and lisinopril (Prinivil) help reduce strain on the arteries. In severe cases, procedures such as angioplasty and stent placement may be necessary to restore blood flow in blocked arteries.

Prognosis of Atherosclerosis

The outlook for individuals with atherosclerosis depends on the severity of the condition and how well it is managed. Early detection and lifestyle modifications can significantly reduce the risk of complications. Medications help control cholesterol and blood pressure, preventing further artery damage. In cases where atherosclerosis has led to severe blockages, medical procedures can improve blood flow and reduce the risk of heart attacks or strokes. Long-term management and regular check-ups are essential for maintaining heart health and preventing disease progression.

Living with Atherosclerosis

Managing atherosclerosis requires a lifelong commitment to heart-healthy habits. Eating a balanced diet, engaging in regular exercise, quitting smoking, and managing stress contribute to better cardiovascular health. Regular monitoring of cholesterol, blood pressure, and overall heart function helps track progress and prevent complications. Support from healthcare providers, lifestyle modifications, and adherence to prescribed medications can improve quality of life and reduce the impact of atherosclerosis.

Conclusion

Atherosclerosis is a serious condition that affects the arteries and increases the risk of cardiovascular disease. Understanding its causes, symptoms, and treatment options is essential for prevention and management. Lifestyle changes, medications, and medical procedures play key roles in controlling the condition and reducing the risk of complications.

References

1. Libby P. Mechanisms of acute coronary syndromes and their implications for therapy. N Engl J Med. 2013;368(21):2004-2013. https://doi.org/10.1056/NEJMra1216063


2. Lusis AJ. Atherosclerosis. Nature. 2000;407(6801):233-241. https://doi.org/10.1038/35025203


3. Ross R. Atherosclerosis-an inflammatory disease. N Engl J Med. 1999;340(2):115-126. https://doi.org/10.1056/NEJM199901143400207

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