Right thyroid nodule category 4a is generally recommended to do a puncture biopsy to determine the benign or malignant nature of the nodule, according to the pathological results to consider the next step in the treatment plan, the specific should also follow the doctor’s advice. The TI-RADS classification criteria categorize nodules into 1-6 categories, thyroid nodule category 4a suggests a low degree of suspicion of malignancy, the chance of malignancy is 2%-10%, it is generally recommended to carry out a puncture biopsy to determine the benign or malignant nature of the nodule, which is conducive to the later stage of treatment. If the pathologic result is benign, regular follow-up thyroid ultrasound is sufficient to observe the changes of the nodule; if the result is considered malignant, surgical treatment is required. Patients with thyroid category 4a nodules are generally recommended to undergo puncture biopsy for definitive diagnosis and treatment.