Cholesterol and heart health on aromatase inhibitors

They can for some women. Oestrogen helps keep cholesterol levels and blood vessels healthy. Aromatase inhibitors, such as letrozole, anastrozole and exemestane, lower oestrogen, and some studies have shown small rises in cholesterol and a possible slight increase in some heart and blood vessel problems compared with tamoxifen, which tends to lower cholesterol. The overall effect varies between studies and is modest for most women. Because heart disease is common after menopause, and many breast cancer survivors live for many years, looking after heart health during hormone therapy is sensible for everyone.

Who needs closer attention

Women with high cholesterol, high blood pressure, diabetes, obesity, a smoking history, a family history of heart disease, or previous heart problems benefit most from regular checks.

How it is monitored

A fasting lipid profile, blood pressure and blood sugar are usually checked before or soon after starting, and then periodically, often with your family doctor.

What helps

Regular exercise, a heart-healthy diet, stopping smoking, keeping to a healthy weight, and treating high cholesterol or blood pressure with medicines when needed. Statins can usually be taken safely alongside aromatase inhibitors.

The effect of aromatase inhibitors on cholesterol and heart health is generally modest, and studies do not all agree. For most women with hormone-sensitive breast cancer, the benefit of the tablets in preventing recurrence is much greater than any added heart risk.

Heart disease is a real long-term concern

Many breast cancer survivors live for decades, and heart disease becomes a leading health risk with age. That makes heart care part of good survivorship, whatever tablet you take.

Treatment is effective

High cholesterol and blood pressure respond well to lifestyle changes and medicines. Statins are widely used and generally safe with hormone therapy.

Tamoxifen has trade-offs too

Tamoxifen tends to be kinder to cholesterol, but it carries risks of clots and womb changes. The best choice depends on the whole picture.

What this page cannot tell you

It cannot tell you your own heart risk. Ask your doctor to assess it and plan checks.

Regular activity is one of the most powerful ways to protect the heart, and it helps other side effects of aromatase inhibitors too.

Aim for regular movement

Brisk walking, cycling or swimming on most days lowers blood pressure, improves cholesterol and helps weight.

Add strength training

Two sessions a week strengthen muscles and bones, and ease joint stiffness.

Start safely

If you have heart problems or have been inactive, ask your doctor before starting vigorous exercise, and build up gradually.

Lipid reports list several numbers, and it is easy to focus on just one. Your doctor looks at the whole pattern alongside your other risk factors to decide whether treatment is needed.

The overall pattern

Higher LDL and triglycerides raise heart risk, while higher HDL tends to protect. A report flagged as slightly high is common and does not automatically mean you need medicine.

Your total heart risk

Doctors combine cholesterol with age, blood pressure, diabetes, smoking, family history and weight to estimate your chance of heart problems over the coming years. That estimate guides whether lifestyle changes alone are enough or whether a statin would help.

Fasting and repeat tests

Your doctor may ask you to fast before the test, particularly for triglycerides. A single unusual result is often repeated before decisions are made.

Tracking over time

Keep copies of each report. Seeing how numbers change after starting an aromatase inhibitor, or after lifestyle changes, helps you and your doctor judge progress.