Some patients have large thyroid nodules that can be palpated, so they can be self-tested by palpation. However, most patients cannot be palpated, and the effect of self-examination is poor, so they need to consult a doctor for ultrasonography and blood tests to make a clear diagnosis. Thyroid nodules are lesions caused by localized abnormal proliferation of thyroid cells, and can be detected by palpation in patients with large nodules. At the same time, a swallowing motion is performed to observe whether the nodule moves with the thyroid gland. However, most patients have small thyroid nodules that cannot be palpated, so the results of self-examination are not satisfactory, and they should consult a doctor for relevant examinations, such as ultrasonography and blood tests. Ultrasonography can identify the location, number and size of the nodules, while blood tests include thyroxine and thyroid stimulating hormone. Depending on the results of the tests, it is possible to diagnose whether or not there are thyroid nodules and to determine the nature of the nodules. Thyroid nodules are recommended to be examined by a doctor for a clear diagnosis.