Despite the small size, the thyroid gland is fairly considered one of the most important "workers" of the endocrine system. If it is healthy, then we do not take in the alertness of the mind, the ease of movement, the positive mood and even the harmony of the figure. About that it is unhealthy, with a high degree of reliability can only tell the analysis of the level of hormones in the blood, ultrasound of the thyroid gland, radiography with the use of radioactive iodine, in some cases prescribe a biopsy.