No, hyperthyroidism or hypothyroidism cannot cause diabetes.
There is no medical evidence that diabetes is more common in those with hypo or hyper thyroidism.
However, the reverse condition has been proven by many studies, ie, in those with diabetes, thyroid
disorders are more common than in the general population.
This does not actually mean that diabetes can cause thyroid problems either, but it is generally believed that the same autoimmune
disorder which causes diabetes also causes hypo or hyperthyroidism, since they are both endocrinological conditions.
"Up to 30% of female type 1 diabetic patients have thyroid disease. The rate of postpartum thyroiditis in diabetic patients is three times that in normal women." Link.
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