Thyroid swelling, commonly known as goiter, refers to an abnormal enlargement of the thyroid gland located in the front of the neck. The thyroid gland plays an important role in controlling metabolism, energy levels, and hormone balance in the body. Swelling of the thyroid may occur due to hormonal imbalance, iodine deficiency, infections, or thyroid nodules. In some cases, the swelling may be painless but visible as a lump in the neck. Early diagnosis and proper treatment are important to prevent complications and maintain normal thyroid function.

1. Common Causes of Thyroid Swelling:
   • Iodine Deficiency: Lack of iodine in the diet is one of the most common causes.
   • Thyroid Nodules: Small lumps that develop within the thyroid gland.
   • Hormonal Imbalance: Conditions like hyperthyroidism or hypothyroidism.
   • Autoimmune Disorders: Diseases such as Hashimoto’s thyroiditis or Graves’ disease.
   • Thyroid Infection: Inflammation of the thyroid gland may lead to swelling.