Thyroid nodules are divided into non-neoplastic lesions and thyroid tumors. Non-neoplastic lesions of the thyroid gland include two types of thyroiditis and goiter, which are common and frequent diseases of the thyroid gland. Thyroiditis is divided into acute thyroiditis (infectious thyroiditis), subacute granulomatous thyroiditis (subacute thyroiditis or subthyroiditis), and chronic lymphatic thyroiditis (Hashimoto’s thyroiditis or Hashimoto’s disease); goiter is divided into sporadic goiter and endemic goiter, the common one being endemic goiter (commonly known as “big neck disease”). The common one is endemic goiter (commonly known as “big neck disease”). Thyroid tumors are divided into benign thyroid adenoma and malignant thyroid cancer: thyroid cancer is divided into papillary, follicular, medullary, undifferentiated and some other rare types of cancer. What are the manifestations and symptoms of thyroid nodules? 1.Thyroid nodules found due to neck discomfort, no feeling, slow course of disease, no change in nodules for months or years, or slow growth. 2, without any discomfort, thyroid nodules are found inadvertently due to physical examination, or other tests. 3.Single or multiple thyroid nodules, without pressure pain, can move up and down with swallowing. In some cases, the nodules may suddenly increase in size and become painful due to intra-tumoral bleeding. 4.When there is abnormal function of the thyroid gland, such as hyperthyroidism or hypothyroidism, thyroid nodules are found in combination. 5. When the mass is large, it may compress the trachea or esophagus and cause difficulty in breathing, swallowing, and hoarseness. 6.Some nodules or adenomas can become cancerous, accounting for about 10% – 20%. Enlarged lymph nodes in the neck or metastatic lesions in other areas may occur.