Thick neck may be caused by obesity, hyperthyroidism, thyroid tumor, etc. It is not necessarily cancerous, and further examination is needed to clarify the cause of the disease and treat the symptoms in time. Most of the patients with thick neck are related to obesity and hyperthyroidism, it is recommended to go to the hospital for further examination. Generally speaking, thick neck caused by obesity and hyperthyroidism is seldom cancerous, so the patients don’t need to worry too much. Some patients may have enlarged lymph nodes or thyroid tumors, which may become cancerous in the later stage, while some patients may have enlarged lymph nodes caused by metastasis of certain tumors or enlarged lymph nodes caused by thyroid cancers, which often need early treatment. Different patients have different reasons for their thick necks. If the patient’s neck suddenly thickens, it is recommended to have a timely examination to determine the cause of the disease and standardize reasonable treatment.