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Diabetes complications: what they are and how to prevent them
Key takeaways
- Over years, high glucose damages small vessels (eyes, kidneys, nerves) and large vessels (heart, brain, legs).
- Adults with diabetes are about twice as likely to have heart disease or a stroke.
- Diabetes is a leading cause of kidney failure, adult blindness and lower-limb amputation in the US.
- Most complications can be prevented or slowed by managing the ABCs: A1C, blood pressure and cholesterol — plus not smoking.
The main complications
| Complication | What happens | Early signs |
|---|---|---|
| Heart disease and stroke | Damaged arteries, higher blood pressure and cholesterol | Often none; chest pain, shortness of breath, high BP |
| Kidney disease (nephropathy) | Filters are damaged and leak protein | None at first — found with urine albumin and eGFR tests |
| Eye disease (retinopathy) | Retinal blood vessels leak or grow abnormally | Often none; later blurry vision, floaters |
| Nerve damage (neuropathy) | Nerves, especially in feet and hands, are injured | Tingling, burning, numbness, pain |
| Foot problems | Numbness plus poor circulation lets small wounds turn into ulcers | Sores that heal slowly, color change |
| Peripheral artery disease | Narrowed leg arteries | Leg pain when walking |
| Gum disease, hearing loss, skin infections | Higher infection and vessel risk | Bleeding gums, recurring infections |
| Depression and anxiety | About twice as common with diabetes | Low mood, worry, burnout |
Short-term emergencies
Complications aren't only long-term. Very low blood sugar and very high blood sugar (DKA or HHS) can be life-threatening within hours.
Prevent complications with the ABCs
- A — A1C: below 7% is a common goal for many adults (your target may differ). See the A1C chart.
- B — Blood pressure: below 130/80 mmHg for most people with diabetes. Learn more in normal blood pressure.
- C — Cholesterol: many adults with diabetes benefit from a statin.
- S — Stop smoking: smoking multiplies heart, kidney and foot risks.
Some newer medicines also protect organs: SGLT2 inhibitors and GLP-1 receptor agonists lower the risk of heart and kidney problems in many people with type 2 diabetes. See diabetes treatment.
Checkups you need
| Check | How often (typical) |
|---|---|
| A1C | 2–4 times a year |
| Blood pressure | Every visit, plus at home |
| Dilated eye exam | Every 1–2 years |
| Urine albumin and eGFR (kidneys) | At least yearly |
| Comprehensive foot exam | At least yearly; check your own feet daily |
| Cholesterol | At diagnosis and as advised |
| Dental exam | Every 6 months |
Daily habits that protect you
- Check your feet every day for cuts, blisters or redness.
- Walk most days — even 10 minutes after meals helps glucose.
- Build meals with the plate method.
- Track glucose and blood pressure so problems show up early.
Cardivo keeps your glucose, blood pressure, heart rate and mood in one ad-free journal, with weekly trends and a PDF you can bring to every checkup — and short PHQ-9 and GAD-7 check-ins for the emotional side of living with diabetes.
This guide is general wellness education based on the public sources below. It is not medical advice, diagnosis, or treatment. Cardivo is not a medical device. If you think you are having a medical emergency, call 911.
Frequently asked questions
What are the most common complications of diabetes?
Heart disease and stroke, kidney disease, eye disease (retinopathy), nerve damage (neuropathy) and foot problems are the most common long-term complications.
Can diabetes complications be prevented?
Many can be prevented or slowed by keeping A1C, blood pressure and cholesterol in your target ranges, not smoking, staying active, and getting yearly eye, kidney and foot checks.
How long does it take for diabetes complications to develop?
Usually years. Type 2 diabetes is often present for years before diagnosis, so some people already have early complications when they are diagnosed.
Sources
- CDC — Diabetes complications
- NIDDK — Preventing diabetes problems
- American Diabetes Association — Standards of Care in Diabetes