An enlarged thyroid gland is usually classified as degree III. You can self-test for an enlarged thyroid by touching or looking at the thyroid gland. Normal thyroid glands are usually not palpable, but when they can be touched, it is usually a sign of an enlarged thyroid. If you are able to observe the enlarged thyroid yourself, it is usually classified as an enlarged thyroid of the second degree. If the enlargement of the thyroid gland is observed to exceed the lateral border of the sternocleidomastoid muscle, the enlargement of the thyroid gland is more serious and belongs to the third degree of goiter. However, in general, self-testing goiter is still more difficult, if you suspect that you have a goiter, it is recommended that you consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examinations, and take appropriate measures.