Hi
There are two factors for causes: 1.Family history 2. Environmental factors.
Hereditary -It depends upon closeness of blood relationship like one of parent having diabetes means 40% of risk is there , both the parents means 90% risk is there , none of the parents are not diabetes , but any blood related means 25 % of risk is there .
Environmental factors includes like over eating , poor nutrition ,age , stress , any mild health condition, sex, drug, infection, serum lipids,obesity
Stress : Either physical injury or emotional disturbance is frequently blamed as the initial cause of the disease. .
Drug Induced: Clozapine (Clozaril), olanzapine (Zyprexa), risperidone (Risperdal), quetiapine (Seroquel) and ziprasidone (Geodon) are known to induce this lethal disease.