High Cholesterol: When Should it Be Treated?

High cholesterol is one of the most important risk factors for heart disease. Cholesterol plays a vital role in the body, but when levels become elevated it can contribute to the development of plaque within the coronary arteries that supply blood to the heart.

Over time, this plaque buildup can increase the risk of heart attack and other cardiovascular problems.

Understanding when cholesterol should be treated – and how risk can be assessed – is an important part of maintaining long-term heart health.

What Is Cholesterol?

Cholesterol is a fatty substance carried in the bloodstream. It is essential for many bodily functions, including hormone production and cell structure.

However, high levels of certain types of cholesterol can increase cardiovascular risk.

The main types measured in blood tests include:

LDL cholesterol (“bad” cholesterol)

High levels of LDL cholesterol can lead to plaque buildup in the coronary arteries.

HDL cholesterol (“good” cholesterol)

HDL cholesterol helps remove excess cholesterol from the bloodstream.

Triglycerides

Another type of blood fat that can contribute to cardiovascular risk when elevated.

Why High Cholesterol Matters

When LDL cholesterol levels are elevated, cholesterol can accumulate within the walls of the coronary arteries. Over time this may lead to atherosclerosis, a condition in which plaque narrows the arteries and reduces blood flow to the heart.

This process usually develops gradually over many years and may not cause symptoms until the disease is more advanced.

This is why identifying and managing high cholesterol early can significantly reduce the risk of future heart disease.

When Should Cholesterol Be Treated?

Treatment decisions are usually based on overall cardiovascular risk, rather than cholesterol levels alone.

Factors that influence risk include:

• Age

• Blood pressure

• Smoking status

• Diabetes

• Family history of heart disease

• Cholesterol levels

  
  

Doctors often use risk calculators to estimate the likelihood of developing cardiovascular disease over the next 10 years.

However, these tools sometimes underestimate risk in individuals with strong family history or early plaque development.

The Role of Heart Scans in Risk Assessment

Modern imaging tests can help provide a more personalised assessment of cardiovascular risk.

Calcium score CT scan

This scan measures calcium within the coronary arteries and can detect early plaque formation before symptoms develop.

CT coronary angiogram

This more detailed scan allows doctors to visualise plaque within the coronary arteries and determine whether any narrowing is present.

These tests can help guide decisions about whether cholesterol-lowering treatment is appropriate.

For example, a calcium score of zero often suggests a very low short-term risk of heart disease, whereas the presence of plaque may support starting preventative medication.

How High Cholesterol Is Treated

Treatment may involve a combination of lifestyle measures and medication.

Lifestyle measures may include:

• Improving diet

• Increasing physical activity

• Weight management

• Stopping smoking

  
  

If cholesterol levels remain elevated or cardiovascular risk is higher, medication such as statins may be recommended to reduce LDL cholesterol and lower the risk of heart attack.

Familial Hypercholesterolaemia

Some people inherit a genetic condition called familial hypercholesterolaemia, which leads to very high cholesterol levels from a young age.

This condition significantly increases the risk of premature coronary artery disease and often requires specialist assessment and treatment.

Family screening may also be recommended if this condition is suspected.

When Should You Seek Advice?

You may wish to seek cardiology advice if you:

• Have high cholesterol levels on blood tests

• Have a strong family history of heart disease

• Are unsure whether cholesterol treatment is necessary

• Want a more detailed assessment of your cardiovascular risk

  
  

In some cases, additional tests such as a calcium score or CT coronary angiogram may help clarify the most appropriate treatment strategy.

Book an Appointment

If you would like to discuss your cholesterol levels or assess your cardiovascular risk, a consultation can help determine whether any investigations or treatment may be appropriate.

Appointments are available at Spire Murrayfield Hospital, with access to advanced cardiac imaging where required.