Goitre is a swelling of the thyroid gland, which can lead to a swelling of the neck or larynx (voice box). Goitre is a term that refers to an enlargement of the thyroid (thyromegaly) and can be associated with a thyroid gland that is functioning properly or not.
Worldwide, over 90.54% cases of goitre are caused by iodine deficiency
Signs and symptoms

Goitre which is associated with hypothyroidism or hyperthyroidism may be present with symptoms of the underlying disorder. For hyperthyroidism, the most common symptoms are weight loss despite increased appetite, and heat intolerance. Hypothyroid individuals have weight gain despite of poor appetite, cold intolerance, constipation and lethargy. However, these symptoms are often nonspecific and hard to diagnose.