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Other Types of Diabetes

Type 1 and Type 2 diabetes are by far the most common forms, there are several other recognised types of diabetes and related conditions that are important to understand, especially in clinical and healthcare contexts.

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  • What it is: A form of diabetes that develops during pregnancy (usually in the second or third trimester) in women who didn’t previously have diabetes.

  • Causes: Hormonal changes in pregnancy can cause insulin resistance.

  • Risks: Can lead to complications such as larger birthweight babies, pre-eclampsia, and increased risk of Type 2 diabetes later in life for both mother and child.

  • Typically resolves after birth, but requires careful monitoring.

Gestational Diabetes Mellitus (GDM)

  • What it is: A rare, inherited form of diabetes caused by a genetic mutation affecting insulin production.

  • Features:

    • Usually diagnosed under the age of 25.

    • Can often be managed without insulin.

    • There are several subtypes depending on the gene affected (e.g., HNF1A, HNF4A, GCK).

  • Often misdiagnosed as Type 1 or Type 2.

Maturity-Onset Diabetes of the Young (MODY)

  • What it is: A very rare form of diabetes that presents in infants under 6 months old.

  • Causes: Caused by genetic mutations affecting insulin secretion.

  • Types:

    • Transient NDM: Disappears during infancy but may return later in life.

    • Permanent NDM: Lifelong condition requiring insulin or other treatment.

Neonatal Diabetes Mellitus (NDM)

 

  • What it is: Diabetes that results as a consequence of another medical condition or treatment.

  • Causes include:

    • Pancreatic diseases (e.g., pancreatitis, cystic fibrosis, pancreatic cancer)

    • Endocrine disorders (e.g., Cushing’s syndrome, acromegaly)

    • Medication-induced (e.g., long-term steroid use, certain antipsychotics)

Secondary Diabetes

  • What it is: Sometimes called Type 1.5 diabetes, it’s a slow-progressing form of autoimmune diabetes.

  • Features:

    • Often diagnosed in adults over 30.

    • Initially may not require insulin, like Type 2, but eventually insulin therapy is needed.

    • Positive for diabetes-related autoantibodies (like Type 1).

Latent Autoimmune Diabetes in Adults (LADA)

  • What it is: A form of secondary diabetes triggered by prolonged or high-dose corticosteroid use.

  • Why it happens: Steroids increase blood glucose levels by causing insulin resistance.

  • Common in: Patients with inflammatory diseases, organ transplant recipients, and those undergoing chemotherapy.

Steroid-induced Diabetes

  • Wolfram Syndrome (DIDMOAD): Diabetes Insipidus, Diabetes Mellitus, Optic Atrophy, and Deafness.

  • Alström Syndrome: Diabetes along with obesity, blindness, hearing loss, and heart disease.

  • Cystic Fibrosis-related Diabetes (CFRD): A unique form of diabetes seen in people with cystic fibrosis due to pancreatic damage.

Less Common Genetic & Rare Forms

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