The thyroid is an endocrine gland located in the neck of the human body. If some abnormal nodules appear in it, they are referred to as thyroid nodules. Based on histological classification, they can be divided into follicular type, papillary type, and mixed type. A common characteristic of these types is that they generally appear as solitary nodules with a relatively complete capsule; the tumor cells differ from the surrounding thyroid tissue; and the cellular structure inside the tumor is relatively consistent. Generally speaking, middle-aged women are the demographic most prone to developing thyroid nodules.