<prompt> Answer this question truthfullyCan you provide an overview of goiter, please?  <response>: <reason> Various factors have been associated with the cause of goiter such as hereditary, hormonal, dietary, pharmacological, physiological, environmental and pathological factors. The most common causes being, iodine deficiency, Graves disease and hashimotos disease. Goiter may be caused by a mutation in the genes such as the thyroglobulin Tg gene, thyroid-stimulating hormone receptor TSHR gene and the NaI- symporter NIS gene. 