Conclusion
Iodine deficiency is caused by a lack of iodine in the body. Because this nutrient is highly essential in the production of certain hormones, its deficiency is likely to cause a lot of problems in the body.
You can prevent this condition by consuming food containing iodine. It is advisable to visit your healthcare provider if you notice any abnormal swelling in your neck because it might be a result of iodine deficiency.
References
[1] https://my.clevelandclinic.org/health/articles/22391-thyroid-hormone
[2] https://www.endocrineweb.com/conditions/thyroid-nodules/thyroid-gland-controls-bodys-metabolism-how-it-works-symptoms-hyperthyroi
[3] https://emedicine.medscape.com/article/122393-overview
[4] https://www.ncbi.nlm.nih.gov/books/NBK499850/
[5] https://www.britannica.com/topic/vegetarianism
[6] https://www.hsph.harvard.edu/nutritionsource/potassium/