Self-assessment of whether the thyroid gland is normal can be done by sight and touch. 1. Visual: Lift up your neck in front of a mirror and look for the knot in your throat, and then 2 to 3 cm down, that is the thyroid gland. Observe whether there is obvious enlargement or protrusion; carry out the action of swallowing saliva, observe whether there is a lump moving up and down with swallowing. Normal thyroid is so small that it cannot be seen. If it can be seen, it means that the thyroid is enlarged. 2. Touch: Against the mirror, raise the neck, use the right thumb to place on the right side of the trachea under the laryngeal node, and use the remaining four fingers to touch the left side of the thyroid gland, followed by swallowing movements, if you feel the lump that slides up and down with the swallowing movements, suggesting an abnormality. If a lump is felt sliding up and down with the swallowing motion, it is abnormal. The right thyroid is then tested with a different hand. If self-testing reveals abnormalities of the thyroid gland, it is recommended to seek medical attention promptly.