Diabetes and Heart Disease: Why the Risk Is Higher

Diabetes is often discussed mainly as a blood sugar problem, but its effects can reach far beyond glucose levels. Over time, diabetes can affect the blood vessels, arteries, nerves, kidneys, and heart, increasing the risk of cardiovascular disease.

According to the CDC, people with diabetes are about twice as likely to have heart disease or a stroke as people without diabetes.

Understanding this connection is important because many heart-related risks linked with diabetes can be reduced through early detection, regular monitoring, healthy lifestyle choices, and appropriate medical care.

How Does Diabetes Affect the Heart?

Persistently high blood sugar can gradually damage the inner lining of blood vessels. This can make it easier for cholesterol and fatty deposits to build up inside the arteries.

This buildup, known as atherosclerosis, can narrow the arteries and reduce blood flow to the heart. Over time, this may increase the risk of coronary artery disease, heart attack, and stroke.

That is why diabetes management should not focus on blood sugar alone. Blood pressure, cholesterol, body weight, kidney health, smoking, physical activity, and family history also play an important role in cardiovascular health.

Why Is Heart Disease Risk Higher in People With Diabetes?

1. High Blood Sugar Can Damage Blood Vessels

When blood glucose remains high for long periods, it can damage blood vessels and contribute to plaque formation inside the arteries.

As these arteries become narrower, the heart may receive less oxygen-rich blood, increasing the risk of coronary artery disease.

2. Diabetes and High Blood Pressure Often Occur Together

High blood pressure puts additional strain on the heart and artery walls.

When a person has both diabetes and hypertension, the risk of developing cardiovascular problems can increase further. Regular blood pressure checks are therefore especially important for people living with diabetes. Our hypertension and cholesterol management service is built around exactly this combination.

3. Cholesterol Problems Can Increase the Risk

Many people with type 2 diabetes also have abnormal cholesterol or triglyceride levels.

High levels of LDL cholesterol can contribute to plaque buildup in the arteries, while low HDL cholesterol may reduce the body’s ability to remove excess cholesterol.

Managing cholesterol is therefore an important part of protecting the heart. See our guide to managing high cholesterol with an Indian diet.

4. Obesity and Physical Inactivity Can Add to the Risk

Being overweight, having obesity, smoking, eating an unhealthy diet, and not exercising regularly may further increase the risk of heart disease in people with diabetes.

The good news is that many of these risk factors can be improved with proper medical guidance and consistent lifestyle changes.

Diabetes Can Also Increase the Risk of Heart Failure

Heart problems linked with diabetes are not limited to blocked arteries and heart attacks.

Diabetes is also associated with an increased risk of heart failure, a condition in which the heart cannot pump blood as efficiently as the body needs.

Possible warning signs include:

• Shortness of breath
• Swelling in the feet or ankles
• Unusual tiredness
• Reduced exercise capacity
• Difficulty breathing while lying down

People with diabetes should not ignore these symptoms, especially if they also have high blood pressure, kidney disease, or an existing heart condition.

It is also worth knowing that diabetes can blunt the nerves that carry pain signals, so a heart attack in a diabetic patient may cause little or no chest pain. Learn the warning signs of a heart attack you should never ignore.

How Can People With Diabetes Protect Their Heart?

Having diabetes does not mean that heart disease is unavoidable. Good diabetes management combined with cardiovascular risk reduction can make a significant difference.

Keep Blood Sugar Under Control

Regular blood glucose monitoring and HbA1c testing can help you and your doctor understand how well your diabetes is controlled.

Your ideal blood sugar target may vary depending on your age, medications, overall health, and other medical conditions.

Check Your Blood Pressure Regularly

High blood pressure often has no obvious symptoms.

Regular monitoring, lifestyle modifications, and taking prescribed medicines correctly can help protect your heart and blood vessels.

Know Your Cholesterol Numbers

Your doctor may recommend tests for:

• LDL cholesterol
• HDL cholesterol
• Triglycerides
• Total cholesterol

Keeping these values within a healthy range can reduce cardiovascular risk.

Stay Physically Active

Regular physical activity can support blood sugar control, improve fitness, and help maintain a healthy weight.

Walking is often a simple way to begin. However, people with existing heart disease or long-standing diabetes should discuss their exercise plan with their doctor before starting a new routine. If you have had heart surgery, our guide to cardiac rehab exercises after open heart surgery shows how to build activity back safely.

Follow a Heart-Healthy Diet

Include more:

• Fresh vegetables
• Fruits
• Whole grains
• High-fibre foods
• Lean protein sources
• Nuts and seeds in moderate portions

Try to reduce sugary drinks, heavily processed foods, excess salt, and foods high in saturated or trans fats. For practical, local suggestions see the best food habits for a healthy heart.

Avoid Smoking

Smoking damages blood vessels and significantly increases cardiovascular risk.

For people with diabetes, quitting smoking is one of the most important steps toward protecting long-term heart health.

When Should You See a Cardiologist?

If you have diabetes, it may be useful to have your cardiovascular risk assessed, particularly if you also have:

• High blood pressure
• High cholesterol
• Kidney disease
• Obesity
• A family history of heart disease
• Long-standing diabetes
• A history of smoking
• Chest discomfort
• Unexplained breathlessness

Depending on your symptoms and medical history, your cardiologist may recommend tests such as an ECG, 2D Echo, TMT, blood investigations, or further cardiac evaluation when clinically appropriate. Current test prices are published on our website.

About Dr. Kamalakar Kosaraju

Dr. Kamalakar Kosaraju is an experienced Interventional Cardiologist in Guntur with more than a decade of clinical experience. He holds an M.D. in General Medicine, completed his D.M. in Cardiology from Osmania Medical College, and is a Fellow of the European Society of Cardiology (FESC).

At Kamalakar Heart Centre, his approach focuses on accurate diagnosis, patient education, preventive cardiac care, and personalised treatment plans. He treats conditions including coronary artery disease, chest pain, hypertension, heart failure, and other cardiovascular disorders.

For patients living with diabetes, a cardiovascular assessment can help identify important risk factors such as high blood pressure, cholesterol problems, and early signs of heart disease.

Frequently Asked Questions

Does diabetes always lead to heart disease?

No. Diabetes raises the risk, but it does not make heart disease inevitable. Keeping blood sugar, blood pressure and cholesterol well controlled, staying active, eating well and not smoking substantially lowers the risk. Regular check-ups help catch problems early, when they are easiest to treat.

Can a person with diabetes have a heart attack without chest pain?

Yes. Diabetes can damage the nerves that carry pain signals, so some diabetic patients experience a “silent” heart attack with only breathlessness, unusual tiredness, sweating, nausea or jaw and arm discomfort. Any new, unexplained symptom like this should be evaluated urgently — call 112 or 108 or go to emergency cardiac care.

Which heart tests should a diabetic patient have?

A baseline ECG and 2D Echo are commonly advised, with a TMT (treadmill test) if symptoms or risk factors suggest reduced blood flow. Blood tests for cholesterol, triglycerides, HbA1c and kidney function complete the picture. Your cardiologist will decide the right tests and how often to repeat them based on your individual risk.

How often should someone with diabetes see a cardiologist?

There is no single rule. Many people with well-controlled diabetes and no symptoms benefit from a cardiac risk review every year or two, while those with high blood pressure, kidney disease, long-standing diabetes or any symptoms may need closer follow-up. Ask your treating doctor what schedule suits you.

Do diabetes medicines protect the heart?

Some newer classes of diabetes medicines have been shown to reduce cardiovascular risk in suitable patients, in addition to lowering blood sugar. Whether they are right for you depends on your kidney function, other conditions and current treatment — this is a decision for your physician and cardiologist together, never a change to make on your own.