There are many possible causes of Hyperthyroidism such as:
Graves' disease accounts for 60-80% of all cases. It is an autoimmune disorder, whereby the body’s immune system attacks the gland causing it to make more thyroid hormones.
Thyroiditis or inflammation of the thyroid gland causes thyroid hormones to leak into the bloodstream. Thyroiditis can be painless or silent, subacute or postpartum (post- delivery) and can show symptoms of hypothyroidism as well.
Thyroid nodules or lumps are common…