Goitre is a condition in which an abnormal increase in the size of thyroid gland takes place. Goitre primarily occurs due to deficiency of iodine. Also, hyperthyroidism triggers goitre. Various substances interfere with the production of thyroid hormone-like thiocyanates, nitrates and perchlorates, some drugs may contain these as ingredients. Certain foods also contain thiocyanates like cabbage, cauliflower, etc. These substances are goitrogenic.[Image will be Uploaded Soon]There are Two Types of Goiter-Euthyroid Goiter- In Euthyroid Goiter hormone levels are within the lower range of the normal valueSimple Endemic Goiter- Occurs due to iodine deficiency in the diet. Geographical regions also play a role in this. For example- regions away from the sea coast where the water and soil are low in iodine content have more cases of simple endemic goitre.