There are many causes of neck swelling, including lesions of several organs in the neck area, which can be either benign or malignant in nature, such as thyroid disorders that lead to neck swelling. Some benign diseases, such as simple goiter caused by the lack of trace elements of iodine, are benign and can be treated promptly with appropriate treatment. It can also be a malignant disease, such as a tumor of the thyroid gland, which causes the thyroid gland to swell, resulting in a swollen neck, which also requires prompt treatment. Apart from thyroid, other causes can also lead to neck enlargement, such as lymphadenitis, metastatic tumors involving lymph nodes, or some blood system tumors, which can manifest as swollen lymph nodes in the neck, all of which need to be diagnosed and treated in a timely manner.