Simple goiter is an enlargement of the thyroid gland, which is located in the neck. This condition often occurs due to a deficiency of iodine, an essential nutrient needed for the production of thyroid hormones. When the body lacks iodine, the thyroid enlarges in an attempt to produce more hormones, leading to a visible swelling. Simple goiter is usually not harmful and may not cause any symptoms. However, in some cases, it can lead to difficulties in swallowing or breathing if the enlargement is significant. Treatment often involves increasing iodine intake through diet or supplements, depending on the underlying cause.