Cardiovascular disease — heart attack and stroke — is the most serious complication of type 2 diabetes. It’s the leading cause of death among adults with diabetes, and according to the Centers for Disease Control and Prevention, adults with diabetes are nearly twice as likely to die from heart disease or stroke as adults without diabetes. That risk builds quietly for years before symptoms appear, which is why cardiovascular health is now treated as a top priority in diabetes care, not an afterthought.
This doesn’t mean other complications are minor. Diabetes can also damage the kidneys, eyes, nerves, and feet. But cardiovascular disease causes the most deaths, the most hospitalizations, and the most long-term disability of any diabetes-related complication — which is why it earns the “most serious” label.
Why Cardiovascular Disease Outranks Other Diabetes Complications
Every complication of type 2 diabetes traces back to the same root cause: chronically elevated blood sugar damages blood vessels and nerves over time. What makes cardiovascular disease different is scale and speed. Damage to small blood vessels (in the eyes, kidneys, and nerves) tends to progress slowly and locally. Damage to large blood vessels — the arteries that feed the heart and brain — can trigger a sudden, life-threatening event: a heart attack or stroke.
According to the American Diabetes Association, cardiovascular risk assessment and management is now a core part of every type 2 diabetes treatment plan, alongside blood sugar control. That’s a shift from decades ago, when diabetes care focused almost entirely on glucose numbers.
How High Blood Sugar Damages Your Blood Vessels
Persistently high blood glucose contributes to atherosclerosis — the buildup of fatty plaque inside artery walls. Over years, this process:
- Stiffens and narrows arteries, restricting blood flow to the heart and brain
- Damages the inner lining of blood vessels (the endothelium), making them more prone to clot formation
- Compounds with other common conditions — high blood pressure, high LDL cholesterol, and excess abdominal weight — that frequently occur alongside type 2 diabetes
This is why cardiovascular risk in diabetes is rarely about blood sugar alone. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) notes that managing blood pressure and cholesterol, alongside A1C, is essential to lowering heart attack and stroke risk in people with diabetes.
Why the Risk Builds Before You’re Even Diagnosed
One reason cardiovascular disease hits so hard in type 2 diabetes is timing. Type 2 diabetes typically develops gradually, often preceded by years of prediabetes where blood sugar is elevated but not yet high enough for a diagnosis. During that undetected stretch, blood vessels can already be accumulating damage. That’s part of why the American Diabetes Association recommends cardiovascular risk screening — blood pressure, cholesterol, and weight — starting at the time of a type 2 diabetes diagnosis, not years later.
Duration of diabetes also matters. The longer someone has lived with elevated blood sugar, the more time atherosclerosis has had to progress. This is one reason early, consistent management after diagnosis has an outsized effect on long-term outcomes compared to tightening control after years of poor glucose management.
Who Faces the Highest Risk
Cardiovascular risk isn’t distributed evenly among people with type 2 diabetes. Risk tends to be higher for people who also have:
- High blood pressure or high LDL cholesterol
- A longer duration of diabetes, or diabetes diagnosed at a younger age
- A family history of heart disease or stroke
- Obesity or a sedentary lifestyle
- A history of smoking
- Existing kidney disease, which independently raises cardiovascular risk
The CDC has also noted that cardiovascular and diabetes-related death rates are not the same across all racial and ethnic groups in the U.S., with disparities linked to differences in access to care, screening, and treatment. Anyone with type 2 diabetes benefits from asking their care team directly where they stand on these risk factors, rather than assuming average risk applies.
Other Serious Complications Worth Knowing
Cardiovascular disease is the most severe complication, but type 2 diabetes can affect nearly every organ system if blood sugar stays elevated for years. The most common complications include:
- Heart disease and stroke — the leading cause of death in people with diabetes. See our guide on diabetes and heart disease for warning signs and prevention steps.
- Kidney disease (diabetic nephropathy) — high blood sugar can damage the kidneys’ filtering units over time, sometimes leading to kidney failure. Learn more in our piece on type 2 diabetes and kidney health.
- Diabetic retinopathy — damage to the blood vessels in the retina, a leading cause of blindness in adults. Our diabetic retinopathy guide covers stages and treatment.
- Nerve damage (neuropathy) — numbness, tingling, or pain, most often in the feet and hands, that can progress if blood sugar remains uncontrolled.
- Foot complications — reduced sensation and poor circulation raise the risk of ulcers and, in severe cases, amputation.
For a full breakdown of how these complications develop and how to catch them early, see our type 2 diabetes complications guide.
A Related Risk: Peripheral Artery Disease
Cardiovascular disease isn’t limited to the heart and brain. Type 2 diabetes also raises the risk of peripheral artery disease (PAD), where narrowed arteries reduce blood flow to the legs and feet. PAD often shows up as leg pain or cramping while walking that eases with rest, and it’s a major contributor to the foot complications — including slow-healing wounds and, in advanced cases, amputation — that are more common in people with long-standing diabetes. Because PAD shares the same underlying vascular damage as heart disease and stroke, the same prevention steps apply: blood sugar, blood pressure, and cholesterol management, plus not smoking, as outlined by the American Heart Association.
Warning Signs You Shouldn’t Ignore
Because cardiovascular disease can develop silently, it’s worth knowing the symptoms that warrant immediate medical attention:
- Chest pain, pressure, or tightness, especially with exertion
- Shortness of breath, with or without chest discomfort
- Sudden numbness or weakness on one side of the body, slurred speech, or vision changes (possible stroke signs)
- Unusual fatigue, lightheadedness, or swelling in the legs and feet
People with diabetes can sometimes have a heart attack with little or no chest pain due to nerve damage that dulls pain signals — a phenomenon called “silent ischemia.” That’s one more reason routine cardiovascular screening matters, even without obvious symptoms. If you experience any of the symptoms above, seek emergency care immediately rather than waiting to see if they pass.
How to Lower Your Cardiovascular Risk
The good news: most of the risk factors that drive cardiovascular disease in type 2 diabetes are modifiable. Steps supported by the ADA and CDC include:
- Manage blood sugar within your target range — work with your care team on an individualized A1C goal.
- Control blood pressure and cholesterol — these compound cardiovascular risk independently of glucose levels.
- Move regularly — even moderate activity, like brisk walking most days, supports heart health and blood sugar control.
- Eat a heart-healthy pattern — emphasizing vegetables, whole grains, lean protein, and healthy fats while limiting sodium and saturated fat.
- Don’t smoke — smoking and diabetes together substantially raise cardiovascular risk.
- Take prescribed medications consistently — including any statins, blood pressure medications, or newer diabetes medications shown to reduce cardiovascular risk, as recommended by your doctor.
- Get regular checkups — routine screening can catch rising blood pressure, cholesterol, or early kidney changes before they become emergencies.
Frequently Asked Questions
What is a major risk factor for diabetes complications?
Prolonged high blood sugar is the central driver, but it rarely acts alone. High blood pressure, high LDL cholesterol, smoking, and excess weight all compound the risk of both cardiovascular disease and other complications.
What are the most common complications of type 2 diabetes?
The most common are cardiovascular disease (heart attack and stroke), kidney disease, diabetic retinopathy (eye damage), nerve damage (neuropathy), and foot complications. Cardiovascular disease is the most severe because it’s the leading cause of death.
Can diabetes complications be prevented?
Many complications can be prevented or delayed with consistent blood sugar, blood pressure, and cholesterol management, along with regular screening. Some damage, once it occurs, can be slowed but not fully reversed — which is why early prevention matters most.
How often should cardiovascular risk be checked?
Your care team will typically check blood pressure at every visit and review cholesterol and other cardiovascular risk factors at least once a year, more often if you have existing heart, kidney, or blood pressure concerns. If you’re unsure when you were last screened, ask at your next appointment — it’s a simple question that can catch a rising risk early.
Last updated: July 9, 2026. This article is for education and is not medical advice; talk to your clinician about your individual risk and treatment plan.
