Diabetes and Stroke Risk: What You Need to Know

People with diabetes are up to twice as likely to have a stroke as people without it. They also tend to have strokes at a younger age, with worse outcomes, and a higher chance of a second stroke. Every two minutes, an adult with diabetes in the U.S. is hospitalised for a stroke.

This guide explains how diabetes raises stroke risk, what symptoms to watch for, which prevention strategies work, and what the latest research says about medications that offer extra protection. For a broader view of stroke risk factors, see our stroke prevention guide.

How Diabetes Increases Stroke Risk

Diabetes causes blood sugar to build up in the bloodstream. Over time, this high glucose level damages blood vessels throughout the body, including those that supply the brain. The damage happens through three main pathways.

• Large artery atherosclerosis: high blood sugar, dyslipidaemia, and insulin resistance accelerate plaque buildup in the large arteries leading to the brain. When plaque ruptures, it can cause an immediate ischemic stroke.
• Cerebral small vessel disease: diabetes damages the tiny blood vessels deep inside the brain. This increases the risk of lacunar strokes, which are small but can cause significant disability and cognitive decline.
• Cardiac embolism: people with type 2 diabetes have a 35 percent higher risk of atrial fibrillation compared to the general population. AFib causes clots to form in the heart that can travel to and block arteries in the brain. See our guide on atrial fibrillation and stroke risk.

Diabetes rarely exists alone. Most people with type 2 diabetes also have high blood pressure, high cholesterol, or excess weight, all of which compound the stroke risk independently. The combination is especially dangerous.

Stroke Symptoms in People With Diabetes

The symptoms of stroke in people with diabetes are the same as in anyone else. Recognising them fast saves lives and limits brain damage.

Call 911 Immediately If You Notice Any of These Signs

Sudden weakness or numbness on one side of the face, arm, or leg

Confusion or trouble understanding speech

Sudden vision changes or double vision

Loss of balance, dizziness, or trouble walking

Sudden severe headache with no known cause

A stroke is a medical emergency. Do not wait to see if symptoms improve. Use the BE FAST framework to remember the key warning signs.

Key Numbers That Reduce Your Stroke Risk

Managing diabetes means managing more than blood sugar. The American Diabetes Association and the American Heart Association both emphasise a multifactor approach.

• A1C below 7%: this test shows your average blood glucose over three months. An A1C above 7% is linked to a rising stroke risk. Test two to four times per year. One Swedish study found HbA1c was the strongest predictor of stroke incidence in people with type 2 diabetes.
• Blood pressure below 130/80 mmHg: high blood pressure is the single biggest driver of stroke, and it is extremely common in people with diabetes. Check it regularly and report readings above target to your doctor immediately.
• LDL cholesterol below 70 to 100 mg/dL: guidelines recommend moderate to high-intensity statin therapy for most people with diabetes aged 40 to 75. Statins reduce the buildup of arterial plaque and lower first and recurrent stroke risk.
• Blood glucose below 140 mg/dL: check regularly and keep levels within a healthy daily range. Elevated glucose at the time of a stroke is associated with larger brain infarcts and worse recovery outcomes.

Medications That Reduce Stroke Risk in Diabetes

Not all diabetes medications are equal when it comes to stroke protection. Research from large cardiovascular outcome trials has identified specific drug classes that go beyond blood sugar control.

GLP-1 Receptor Agonists

GLP-1 receptor agonists (including semaglutide, dulaglutide, and liraglutide) lower blood sugar, support weight loss, reduce blood pressure, and lower inflammation. Meta-analyses of large trials show that GLP-1 receptor agonists as a class reduce the risk of fatal or non-fatal stroke by 15 to 17 percent compared to placebo, independent of their blood sugar effects.

The SUSTAIN 6 trial found semaglutide reduced non-fatal stroke risk by 39 percent (HR: 0.61) compared to placebo. The REWIND trial found dulaglutide reduced non-fatal stroke by 24 percent. The 2022 American Diabetes Association guidelines recommend GLP-1 receptor agonists for people with type 2 diabetes and established cardiovascular disease or multiple risk factors.

Pioglitazone

Pioglitazone, a thiazolidinedione, has shown specific benefits for people who have already had a stroke or transient ischaemic attack. The IRIS trial found it reduced the combined risk of recurrent stroke or heart attack by 24 percent in patients with insulin resistance. Post hoc analysis of the PROactive trial showed a 47 percent reduction in stroke recurrence in patients with prior stroke.

The American Heart Association and American Stroke Association 2021 secondary prevention guidelines recommend GLP-1 receptor agonists, pioglitazone, and SGLT2 inhibitors for people with ischemic stroke or TIA who also have diabetes, to reduce the risk of future major cardiovascular events.

Prevention Strategies for People With Diabetes

Comprehensive risk factor management, not blood sugar control alone, is what reduces stroke incidence. A Danish cohort study showed that the five-year risk of first ischemic stroke in people with type 2 diabetes was cut in half between 1996 and 2015, coinciding with widespread use of statins and blood pressure medication.

Key preventive actions include:

• Follow a stroke-prevention diet rich in vegetables, whole grains, healthy fats, and lean protein, while limiting sodium, added sugars, and saturated fat
• Exercise regularly. See our guide on the best cardiovascular exercise for heart health
• Quit smoking. Smoking compounds the vascular damage from high blood sugar and dramatically raises stroke risk
• Maintain a healthy weight to reduce blood pressure, insulin resistance, and systemic inflammation
• Take all prescribed medications exactly as directed, including statins, antihypertensives, and blood sugar-lowering agents
• Keep all medical appointments and test A1C, blood pressure, and cholesterol at the recommended intervals

Stroke Outcomes Are Worse in People With Diabetes

People with diabetes who have a stroke face higher mortality, longer hospital stays, higher readmission rates, and slower recovery than those without diabetes. A meta-analysis found that the risk of stroke recurrence is 50 percent higher in diabetic patients with previous ischemic stroke compared to those without diabetes (HR: 1.50).

Cognitive impairment after stroke is also more common. Around 25 to 30 percent of ischemic stroke survivors develop vascular cognitive impairment. People with type 2 diabetes show significantly worse cognitive function three to six months after stroke compared to those without it.

These outcomes make prevention critical. Managing blood pressure, cholesterol, blood sugar, weight, and medications together gives people with diabetes the best chance of avoiding a first or second stroke.

Understand Your Full Cardiovascular and Stroke Risk

Diabetes is one of the most complex stroke risk factors because it interacts with so many others. The Baledoneen Method uses advanced cardiovascular testing to assess your arterial wall health, inflammation markers, lipid subtypes, blood pressure profile, and genetic cardiovascular risk to build a prevention plan specific to you.

>>> Learn About the Baledoneen Method

Frequently Asked Questions

Why does diabetes increase stroke risk?

Diabetes damages blood vessels through high blood sugar, inflammation, and insulin resistance. These changes accelerate atherosclerosis in large arteries, injure small blood vessels inside the brain, and raise the risk of atrial fibrillation, all of which are direct causes of stroke.

What are the symptoms of a stroke in people with diabetes?

Stroke symptoms are the same regardless of diabetes: sudden weakness or numbness on one side, confusion, trouble speaking, vision changes, loss of balance, or a sudden severe headache. These are medical emergencies and require calling 911 immediately.

How can people with diabetes prevent stroke?

Managing blood pressure below 130/80, keeping A1C below 7%, controlling LDL cholesterol, exercising regularly, eating a heart-healthy diet, quitting smoking, and taking all prescribed medications as directed together significantly reduce stroke risk.

Do certain diabetes medications protect against stroke?

Yes. GLP-1 receptor agonists such as semaglutide and dulaglutide have been shown to reduce stroke risk by 15 to 17 percent in large clinical trials. Pioglitazone has also shown strong secondary prevention benefits for people who have already had a stroke or TIA.

Can people with diabetes recover fully after a stroke?

Recovery varies widely. People with diabetes tend to have worse outcomes including higher mortality, longer hospital stays, and greater cognitive impairment than those without diabetes. Optimising blood pressure, blood sugar, and cholesterol after a stroke improves recovery and reduces recurrence risk.

Medical Disclaimer: This article is for educational purposes only. It is not a substitute for professional medical advice. Speak with your doctor about your personal stroke risk and diabetes management plan.

Key Sources

Stroke.org: Diabetes and Stroke Prevention

Cleveland Clinic: Diabetes and Stroke

Mullen et al.: Diabetes and Stroke — Epidemiology, Pathophysiology, and Management (PMC, 2023)