Thyroid nodule category 4a, generally referred to as TIRADS-4A grade in the ultrasound malignancy risk stratification of thyroid nodules, is a low degree of suspected malignancy, with a malignancy rate of the nodule ranging from 2% to 10%, which may be more severe, and a puncture biopsy is feasible to determine the benignity or malignancy of the nodule, if necessary. TIRADS grade 4 for thyroid nodules is suspicious for malignancy, with a TIRADS-4A malignancy rate of 2% to 10%, which is a low level of suspicion for malignancy. For TIRADS-4A nodules, a thyroid puncture biopsy can be performed if necessary. If the results show benign and asymptomatic thyroid nodules, they are not considered serious and should be reviewed regularly. If the results show malignant thyroid nodules, or if the nodules are large enough to cause pressure symptoms such as difficulty in breathing or swallowing, then the situation is more serious and surgery should be considered. Patients diagnosed with category 4a thyroid nodules should go to the hospital and ask their doctor to make a judgment and choose the appropriate treatment plan for them.