Hi,
I wonder what you actually mean by type 3. Unfortunately beyond type 1 and 2 there is no standard definition.
The link given by Sue above is to problems related to alzheimers. This has been called type 3 in some articles. A few sources also refer to double diabetes ie type 1 with insulin resistance as type 3
More officially, the types of diabetes called 'other' (and listed third ) in the WHO official classifications are called type 3. They are then subdivided into several sections.
I've included some of the more 'common' examples for each category... but only where I understand what they are, some of the conditions are very rare
Type 3A: genetic defect in beta cells. (this includes MODY, maternally inherited diabetes and deafness))
Type 3B: genetically related insulin resistance. (Donohue syndrome [also known as Leprechaunism])
Type 3C: diseases of and trauma to the pancreas. (eg pancreatitis, pancreatic cancer Haemochromatosis, cystic fibrosis, pancreatectomy)
Type 3D: caused by hormonal defects. (eg Cushing’s disease and syndrome )
Type 3E: caused by chemicals or drugs.(eg Glucocorticoids ,β-Blockers )
Type 3F caused by infections (Congenital rubella)
Type 3G Uncommon forms of immune-mediated diabetes (‘Stiff man/ person’ syndrome)
Type 3H other (Down’s syndrome)
(type 4 is gestational)
And sometimes on forums, partners and parents of people with diabetes are said to have type 3 :lol: