Home » Components of Food MCQs » Goitre: swelling of thyroid glands occurs due to the deficiency of Components of Food MCQs Goitre: swelling of thyroid glands occurs due to the deficiency of September 28, 2022 20 Views Q. Goitre: swelling of thyroid glands occurs due to the deficiency of _________. IodinePhosphorusIronPottasium Answer: Iodine