Type 2 diabetes can develop slowly, and many people have no symptoms at all until blood testing shows high glucose. Some people have symptoms for months or years before diagnosis.
Quick summary
Common symptoms include increased thirst, frequent urination, fatigue, blurry vision, slow-healing cuts, more infections, tingling or numbness, and unexplained weight loss.
Key takeaways
- Symptoms can be mild or absent.
- Blood testing is needed to diagnose diabetes.
- Risk factors include family history, age, prior gestational diabetes, higher weight or waist-related risk, high blood pressure, and low activity.
- Vomiting, dehydration, confusion, or very high glucose symptoms need urgent care.
Why symptoms are easy to miss
High blood sugar may rise gradually, so changes can feel normal. Someone may blame fatigue on work, thirst on hot weather, or blurry vision on screen use.
Symptoms do not prove diabetes, and lack of symptoms does not rule it out. That is why testing matters. A1C, fasting glucose, and oral glucose tolerance testing can identify prediabetes or diabetes before symptoms become obvious.
When to ask about testing
- You have symptoms of high blood sugar.
- You have a family history of type 2 diabetes.
- You had gestational diabetes.
- You have high blood pressure, abnormal cholesterol, or fatty liver disease.
- A clinician has told you that your weight, waist, or lab pattern increases risk.
Practical takeaway
Do not wait for severe symptoms if you have risk factors. A simple blood test can answer more than guessing.
Safety note
This article is not a substitute for medical care. Seek urgent care for vomiting, dehydration, confusion, deep or rapid breathing, severe weakness, or symptoms that feel dangerous.
What to ask your care team
- Which test should I have first?
- Could my symptoms be from high blood sugar or something else?
- How often should I repeat testing if results are normal but risk is high?
Related reading
Source summary
- Symptoms of Diabetes, Centers for Disease Control and Prevention. Patient guidance. Accessed June 5, 2026. Source
- About Type 2 Diabetes, Centers for Disease Control and Prevention. Patient guidance. Accessed June 5, 2026. Source
- Diabetes Testing, Centers for Disease Control and Prevention. Patient guidance. Accessed June 5, 2026. Source
- Diabetes Tests and Diagnosis, National Institute of Diabetes and Digestive and Kidney Diseases. Patient guidance. Accessed June 5, 2026. Source