Characteristics of benign thyroid nodules include regular morphology, no calcification, and vertical to horizontal ratio less than 1. 1. Morphology of nodules: benign nodules usually have regular morphology, clear borders, uniform internal density and poor blood supply. 2. Degree of calcification and aspect ratio of the nodule: benign nodules may have coarse calcification, but usually there is no microcalcification, and the aspect ratio is less than 1. 3. Echogenicity of nodules: ultrasound will show the echogenicity of nodules, usually there are various echogenicity levels from low to high, usually benign nodules have uniform echogenicity and moderate echogenicity. It is recommended to go to a regular hospital as soon as possible to improve the relevant examinations and standardize the treatment under the guidance of the doctor.