What You Need to Know About Diabetes and Heart Disease

Key Takeaways

• Diabetes does not affect blood sugar alone. It also influences blood vessels and heart health over time.
• Cardiovascular disease in people with diabetes can develop quietly, sometimes without typical chest pain or early warning signs.
• Managing blood pressure, cholesterol, and lifestyle factors alongside blood sugar helps reduce long-term cardiovascular risk.
• Regular heart assessments provide clarity and allow potential issues to be identified before symptoms become limiting.

In Singapore, 1 in 11 adults live with diabetes, making it one of the most common chronic conditions across age groups. However, diabetes does not exist in isolation. Beyond blood sugar control, it affects blood vessels and increases the risk of heart disease over time, often without obvious symptoms. 

In this article, we examine how diabetes and cardiovascular disease are connected, why the risk can go unnoticed, and what steps can help protect long-term heart health.

What Is Diabetes?

Diabetes is a condition in which the body is unable to keep blood glucose within a healthy range. This happens when insulin is not produced in sufficient amounts, does not work as it should, or both.

The main types include:

• Type 1 diabetes: An autoimmune condition in which the body produces little or no insulin. It usually develops earlier in life and requires lifelong insulin therapy.
• Type 2 diabetes: The most common form, driven mainly by insulin resistance. Genetics, lifestyle habits, and metabolic factors all contribute to its development.

While these types differ in cause and management, both can affect diabetes and cardiovascular health, especially when blood sugar levels remain elevated over time.

How Does Diabetes Affect the Heart?

Diabetes affects the heart gradually, often over many years. Persistently high blood sugar changes how blood vessels function and how the heart responds to physical demands.

• Blood vessel damage: High blood sugar damages the inner lining of arteries, making them more vulnerable to plaque formation.
• Accelerated atherosclerosis: Diabetes affects how fats and inflammatory substances interact with the artery walls. This encourages fatty deposits to form earlier and grow more rapidly than usual.
• Coexisting conditions: Diabetes often occurs alongside high blood pressure and cholesterol abnormalities, increasing cardiovascular strain.
• More complex coronary disease: Patients with diabetes may develop diffuse or multi-vessel disease, which can affect how treatments are planned.

When to Seek Medical Advice

Cardiovascular disease in people with diabetes does not always cause the typical chest pain that many associate with heart problems. Diabetes can affect the nerves that transmit pain signals, which may blunt or alter how discomfort is felt. As a result, symptoms can be subtle, vague, or easily attributed to stress, ageing, or fatigue.

Consider seeking medical review if you experience:

• New or worsening breathlessness, especially during routine activities
• Ongoing fatigue that is unexplained or out of proportion to your activity level
• Chest, upper body, jaw, or back discomfort that feels unusual or recurrent
• A noticeable decline in exercise tolerance over weeks or months
• Dizziness, light-headedness, or unexplained sweating

With the increased heart disease risk in diabetics, it is important not to wait for severe or obvious symptoms before seeking medical advice. Periodic heart screening and assessment may be appropriate if you have had diabetes for several years, have additional risk factors such as high blood pressure or high cholesterol, or have a family history of heart disease. 

How to Protect Your Heart When You Have Diabetes

Rather than focusing on a single measurement, doctors may recommend managing diabetes along with other risk factors to help prevent or reduce the likelihood of heart problems over time.

1. Support Heart Health Through Daily Habits

Small, consistent adjustments in eating and activity patterns can make a meaningful difference for individuals with diabetes and cardiovascular disease. Consider adopting the following lifestyle changes:

• Eating regular, balanced meals to avoid large blood sugar swings
• Keeping portion sizes in check, especially for refined carbohydrates and sugary foods
• Reducing reliance on highly processed foods, which often affect both blood sugar and cholesterol levels
• Staying physically active in a safe way, such as walking, light resistance exercises, or doing structured activities suited to your fitness level
• Aiming for consistency rather than intensity, focusing on routines you can maintain over time

2. Attend Regular Heart Assessments

Cardiovascular assessments allow potential problems to be identified before symptoms develop. Regular reviews help establish a baseline and allow doctors to spot meaningful changes early, before symptoms become limiting or concerning.

The type of assessment depends on what needs to be clarified. Some tests focus on how the heart functions during activity, while others look at heart structure or blood flow. For example:

• An echocardiogram assesses how well the heart muscle and valves are working at rest.
• Exercise testing shows how the heart responds to physical stress and increased demand.
• A CT coronary angiography may be considered if there is a need to evaluate the coronary arteries more closely, particularly when risk factors are present, or test results are unclear.

These tests are selected based on individual risk, symptoms, and the duration of diabetes, supporting personalised and appropriate heart care.

Conclusion: Taking a Long-Term View

The relationship between diabetes and cardiovascular disease is well established, but it does not mean heart complications are inevitable. Diabetes affects the heart gradually, which also creates opportunities for early assessment, steady risk management, and informed decision-making over time. 

If you have diabetes and would like clarity on your heart health, Dr Leslie Tay, a heart specialist in Singapore, provides structured cardiovascular assessments and guidance tailored to individual risk profiles. A consultation can help you understand where you stand and what steps may be appropriate for your long-term heart care. Make an appointment today.