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Hyperlipidemia – Causes, Symptoms and Treatment

Hyperlipidemia refers to elevated levels of fats in the blood, particularly cholesterol and triglycerides. It is a major risk factor for cardiovascular disease.

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Things worth knowing about "Hyperlipidemia"

Hyperlipidemia refers to elevated levels of fats in the blood, particularly cholesterol and triglycerides. It is a major risk factor for cardiovascular disease.

What is Hyperlipidemia?

Hyperlipidemia (also spelled hyperlipidaemia) is a medical condition characterized by abnormally high levels of lipids (fats) in the bloodstream. The most commonly elevated lipids are cholesterol (especially LDL cholesterol) and triglycerides. Because elevated blood fat levels rarely cause noticeable symptoms, the condition is often discovered incidentally during routine blood tests.

Causes

Hyperlipidemia is classified as either primary (genetic) or secondary (caused by lifestyle factors or underlying conditions).

Primary Causes

Familial hypercholesterolemia (inherited elevation of LDL cholesterol)
Familial combined hyperlipidemia
Genetic hypertriglyceridemia

Secondary Causes

Unhealthy diet high in saturated fats and sugar
Obesity and physical inactivity
Type 2 diabetes mellitus
Underactive thyroid gland (hypothyroidism)
Chronic kidney disease
Excessive alcohol consumption
Certain medications (e.g., corticosteroids, beta-blockers)

Symptoms

Hyperlipidemia is typically asymptomatic. In severe cases, the following physical signs may appear:

Xanthomas: fatty deposits under the skin, often near tendons or joints
Xanthelasmas: yellowish fatty deposits on the eyelids
Corneal arcus: a whitish ring around the edge of the cornea
Abdominal pain (in cases of very high triglycerides, with risk of pancreatitis)

Over time, persistently elevated blood lipid levels significantly increase the risk of atherosclerosis, heart attack, and stroke.

Diagnosis

Diagnosis is made through a blood test known as a lipid panel or lipid profile, which measures:

Total cholesterol
LDL cholesterol (often called the bad cholesterol)
HDL cholesterol (often called the good cholesterol)
Triglycerides

The blood sample is ideally taken after fasting. According to European guidelines, an LDL cholesterol level below 3.0 mmol/L (approximately 116 mg/dL) is the target for low-risk individuals, with much lower targets recommended for high-risk patients.

Treatment

Lifestyle Modifications

Lifestyle changes form the foundation of treatment for hyperlipidemia:

Dietary changes: reducing saturated fats and trans fats, increasing fiber, fruit, and vegetables
Regular physical activity (at least 150 minutes of moderate exercise per week)
Weight loss in overweight or obese individuals
Smoking cessation and reduction of alcohol intake

Medical Treatment

When lifestyle modifications are insufficient, medications may be prescribed:

Statins (e.g., atorvastatin, simvastatin): first-line therapy for LDL reduction
Ezetimibe: reduces cholesterol absorption in the intestine
PCSK9 inhibitors (e.g., evolocumab): monoclonal antibodies for significant LDL reduction in high-risk patients
Fibrates: primarily used to lower elevated triglyceride levels
High-dose omega-3 fatty acids: used as adjunctive therapy for hypertriglyceridemia

References

Mach F et al. - 2019 ESC/EAS Guidelines for the management of dyslipidaemias. European Heart Journal. 2020;41(1):111-188.
World Health Organization (WHO) - Cardiovascular diseases: Key facts. WHO, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases
Grundy SM et al. - 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Journal of the American College of Cardiology. 2019;73(24):e285-e350.

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