Thyroid nodule 3×1.7mm is not necessarily serious, if 3×1.7mm nodule is benign nodule and no obvious symptoms, generally not very serious, need regular review. If there is a possibility of malignant changes, it is relatively serious. It is recommended to follow the doctor’s advice for treatment. 1. Not very serious: patients should go to the hospital in time for examination to clarify the nature of the thyroid nodules, if they are benign nodules and no obvious symptoms, generally not particularly serious, need regular observation. If symptoms such as dysphagia, dyspnea, foreign body sensation, etc. have appeared, timely surgery is needed to remove the nodule. 2. More serious: If it belongs to malignant nodules, it is more dangerous and may affect the patient’s life safety. They need to be removed in time. To summarize, it is recommended that patients should consult the doctor in time, do systematic examination, and strictly follow the doctor’s instructions to avoid deterioration of the condition.