If a pregnant woman has a thyroid nodule that is small in size and does not cause symptoms of local organ and nerve compression, it is important to analyze the nodule objectively based on the size and nature of the nodule. If the nodules are not found to have malignant signs through ultrasound examination, the nodules are considered benign. In this case, thyroid nodules will not have serious effects on pregnant women. Patients can closely observe the changes of the nodules through ultrasound examination and do not need special treatment for the time being. 2. If the hormone level in the body is disturbed during pregnancy, the size of the thyroid nodules increases continuously and causes compression of the trachea, esophagus and nerves. Through ultrasound examination, thyroid nodules with obvious blood flow signals, calcification foci and signs of malignant tumors such as aspect ratio greater than 1 are found. The nodules were highly suspected to be cancerous, and the patient was advised to undergo surgery promptly to avoid serious complications.