Thyroid cysts are lumps that appear in the neck and are fluid-containing lumps that move up and down as a person eats and talks. There are many causes of thyroid cysts, for example, thyroid related diseases such as hyperthyroidism and hypothyroidism can cause an enlarged thyroid gland. In addition to related diseases, when the body has long-term inflammation, there is also a lack of trace elements such as iodine, selenium, etc., resulting in abnormal synthesis of thyroid hormones, which can also lead to the formation of thyroid cysts, thyroid cysts are a type of benign thyroid nodules. Long-term irregularities in lifestyle and frequent late nights, resulting in rhythmic disorders in the human body and lowered immunity, can also cause thyroid cysts.