What are the types of Diabetes Mellitus (DM)?

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Last updated: April 24, 2025 • View editorial policy

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From the Guidelines

There are four main types of diabetes: Type 1 diabetes, Type 2 diabetes, Gestational diabetes mellitus, and Other specific types of diabetes. These categories are based on the underlying causes of the disease, such as autoimmune destruction of pancreatic beta cells in Type 1 diabetes, insulin resistance and impaired insulin secretion in Type 2 diabetes, and high blood sugar levels during pregnancy in Gestational diabetes mellitus 1. The classification of diabetes is crucial for determining the appropriate treatment approach, as different types of diabetes require different management strategies, such as insulin therapy, oral medications, lifestyle modifications, or a combination of these strategies.

Some key characteristics of each type of diabetes include:

  • Type 1 diabetes: typically develops in childhood or adolescence, results from autoimmune destruction of pancreatic beta cells, and requires lifelong insulin therapy 1
  • Type 2 diabetes: the most common form, often develops in adulthood, and is related to lifestyle factors like obesity and physical inactivity 1
  • Gestational diabetes mellitus: develops during pregnancy, usually resolves after childbirth, but increases the risk of developing Type 2 diabetes later 1
  • Other specific types of diabetes: include monogenic diabetes syndromes, diseases of the exocrine pancreas, and drug- or chemical-induced diabetes 2

Understanding the specific type of diabetes is essential for providing personalized care and improving patient outcomes, as different types of diabetes have distinct pathophysiologies and require tailored treatment approaches 1.

From the FDA Drug Label

The text does not explicitly mention the number of types of diabetes, but it does mention Type 1 Diabetes and Type 2 Diabetes. The FDA drug label mentions two types of diabetes:

  • Type 1 Diabetes
  • Type 2 Diabetes 3 4

From the Research

Types of Diabetes

There are several types of diabetes, including:

  • Type 1 diabetes mellitus
  • Type 2 diabetes mellitus
  • Gestational diabetes mellitus (GDM)
  • MODY 2 (a form of GDM caused by a glucokinase gene mutation) 5

Characteristics of Each Type

  • Type 1 diabetes mellitus: characterized by a failure in insulin production 6
  • Type 2 diabetes mellitus: characterized by a decrease in insulin sensitivity and function 6
  • Gestational diabetes mellitus (GDM): develops during pregnancy, typically in the second or third trimester 7, 8, 9, 5
  • MODY 2: a rare form of GDM caused by a genetic mutation, accounting for 1-2% of GDM cases 5

Prevalence and Management

  • The prevalence of diabetes is increasing globally, with type 1 and type 2 diabetes being the most common forms 6
  • Gestational diabetes mellitus (GDM) is diagnosed in approximately 5.5% of all births in Germany 5
  • Management of diabetes typically involves lifestyle modifications, insulin therapy, and/or oral hypoglycemic agents 7, 8, 9, 6

References

9
Research

Treatment of Diabetes in Pregnancy With Metformin.

Obstetrics and gynecology, 2024

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.