There are many causes of thyroid cysts, roughly the following aspects: 1, may be related to poor lifestyle and dietary habits, such as patients often smoking, drinking, excessive socializing, working late at night, as well as other unhealthy dietary habits, including overeating, often eat greasy food and other unhealthy food, etc.; 2, the occurrence of thyroid cysts is also associated with emotions, in the theory of Traditional Chinese Medicine (TCM) In Chinese medicine theory, the cause of thyroid cysts is mainly due to liver depression and fire, resulting in liver depression and stagnation of qi, which leads to phlegm and stagnation of blood and qi stagnation and poor qi and blood circulation, and the formation of qi stagnation and blood stasis, phlegm condensation in the front of the neck, which leads to the occurrence of thyroid cysts; 3, it may be due to the lack of iodine, iodine is an essential substance in the thyroid gland, and a lack of iodine can lead to goiter as well as a series of other problems with the thyroid, while thyroid cysts are also related to emotions, which are often associated with the development of a healthy diet. If iodine is lacking, it may lead to goiter and a series of other thyroid problems, and thyroid cysts are closely related to iodine deficiency, so iodine deficiency may also lead to thyroid cysts.