Basics
Diabetes is a group of conditions that affect how the body manages blood glucose. The types can sound similar, but their causes, progression, and treatment paths can be very different.
Comparison
The simple version: Type 1 and Type 1.5 / LADA involve the immune system, Type 2 is usually centered on insulin resistance, and other forms can arise from pregnancy, genetics, or another medical cause.
T1D
An autoimmune disorder where the immune system attacks insulin-producing beta cells. The body makes little or no insulin, so insulin has to be managed from outside the body.
Autoimmune. Little or no insulin production.
Learn about Type 1LADA
A slower-developing autoimmune form of diabetes in adults. It can resemble Type 2 at first, but insulin production declines over time because the immune system is involved.
Autoimmune, but usually more gradual than classic Type 1.
T2D
A form of diabetes where the body becomes resistant to insulin and may later produce too little. Genetics, age, environment, and lifestyle can all play roles.
Insulin resistance, often with declining insulin production.
Pregnancy
High blood sugar that develops during pregnancy, often because pregnancy-related hormone changes increase insulin resistance.
Usually pregnancy-specific, but it can signal future risk.
Risk stage
Blood glucose is higher than expected but below the diagnostic threshold for diabetes. It is often discussed as a warning stage before Type 2 diabetes.
Elevated blood sugar below the diabetes range.
Genetic
Rare forms of diabetes caused by a change in a single gene, including some MODY and neonatal diabetes subtypes.
Genetic rather than autoimmune or typical insulin resistance.
Secondary
Diabetes that results from another medical condition, medication, pancreatic disease, surgery, or endocrine disorder.
Driven by another condition or treatment.
At a glance
This is a plain-English orientation, not a diagnostic tool. Diagnosis depends on clinical history, lab testing, and medical judgment.
| Condition | Insulin production | Insulin resistance | Autoimmune? |
|---|---|---|---|
| Type 1 | Little or none | Usually not primary | Yes |
| Type 1.5 / LADA | Gradual decline | Low to mild | Yes |
| Type 2 | Declines over time | Yes | No |
| Gestational | Often still produced | Pregnancy-related | No |
| Prediabetes | Usually still produced | Beginning | No |
| Monogenic | Varies | Varies | No |
| Secondary | Varies | Varies | No |
Prevalence
At a high level, the distribution of diabetes types is similar in the United States and worldwide. The bigger difference is how many people are affected overall, and which communities carry the heaviest burden.
U.S. diabetes
40.1MEstimated Americans living with diagnosed or undiagnosed diabetes.
U.S. Type 1
2.1MEstimated people with diagnosed Type 1 diabetes in the United States.
U.S. prediabetes
115.2MEstimated U.S. adults living with prediabetes.
Worldwide diabetes
589MEstimated adults living with diabetes worldwide.
| Diabetes type | United States | Worldwide |
|---|---|---|
| Type 2 Diabetes | ~90-95% of diabetes cases | ~90-95% of diabetes cases |
| Type 1 Diabetes | ~5-10% of diabetes cases | ~5-10% of diabetes cases |
| Gestational Diabetes | About 2-10% of pregnancies, depending on population and diagnostic criteria | About 5-15% of pregnancies, depending on population and diagnostic criteria |
| Monogenic Diabetes | <2% | <2% |
| Secondary Diabetes | <2% | <2% |
| LADA | Often estimated at 2-12% of adults initially diagnosed with Type 2 diabetes | Similar estimates worldwide |
Visual breakdown
Sources: CDC National Diabetes Statistics Report and IDF Diabetes Atlas . Estimates vary by source, population, diagnostic criteria, and year.
