Understanding type 2 diabetes
A guide to symptoms, diagnosis and the care that can help you manage type 2 diabetes.
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What is type 2 diabetes?
Type 2 diabetes develops when the body does not use insulin effectively and cannot make enough to keep blood sugar within a healthy range. Insulin is a hormone that helps sugar move from the blood into cells for energy. When this process is disrupted, sugar builds up in the blood. [1]
The condition often develops gradually. With a care plan that fits your needs, you can manage blood sugar and reduce the risk of complications.
Symptoms and risk factors
Some people have no noticeable symptoms. Others may experience:
- More thirst and more frequent urination.
- Tiredness or blurred vision.
- Slow-healing wounds or repeated infections.
Risk is influenced by family history, increasing age, excess body weight, physical inactivity, prediabetes and previous gestational diabetes. Ask your clinician whether testing is appropriate, even if you feel well. [2]
When to seek urgent help
Trouble breathing, or vomiting that prevents you from keeping fluids down, needs immediate medical attention. Seek emergency care rather than waiting for a routine appointment. [7]
How is it diagnosed?
Diagnosis uses laboratory blood tests, such as HbA1c, fasting blood glucose or an oral glucose tolerance test. HbA1c reflects average blood sugar over roughly three months. [3]
| HbA1c result | Range |
|---|---|
| Below 5.7% | Normal |
| 5.7–6.4% | Prediabetes |
| 6.5% or higher | Diabetes |
These are diagnostic ranges, not personal treatment targets. Results usually need confirmation. Pregnancy, anemia and other conditions can affect interpretation.
More about the HbA1c testWhat does treatment involve?
Treatment may combine food choices, physical activity and medicines. Some people need tablets, injections or insulin. The right plan depends on your health, test results, preferences and access to care. Your clinician can explain the benefits and possible side effects of each option. [4]
Follow the plan agreed with your care team. Discuss side effects, affordability or difficulties with your routine before changing or stopping a medicine.
Looking after your long-term health
Diabetes care also includes blood pressure, cholesterol and checks for eye, kidney and foot problems. Agree with your care team how often to review these and whether you need to check blood sugar at home. Managing diabetes is ongoing; your plan may change as your needs change. [5]
Common questions
Is remission the same as a cure?
No. Remission usually means an HbA1c below 6.5% for at least three months without glucose-lowering medicine. Diabetes can return, so continued monitoring matters. Never stop medication to try to demonstrate remission; discuss any change with your clinician. [6]
What should I ask at my appointment?
- What do my results mean, and what are my individual targets?
- How should I take my medicines and monitor blood sugar?
- Which symptoms need urgent help, and when is my next review?
Sources and further information
The following sources are in English and open in a new tab.
- CDC · Type 2 diabetes
- NIDDK · Symptoms and causes of diabetes
- NIDDK · Diabetes tests and diagnosis
- NIDDK · Insulin, medicines and other treatments
- NIDDK · Managing diabetes
- American Diabetes Association · Remission criteria
- CDC · Diabetic ketoacidosis and emergency symptoms
This article is for general education. It does not replace a consultation or an individual treatment plan.
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