The TSH levels in children with thyroid deficiency and ectopic thyroid were higher than those in children with thyroid dysplasia, while the T3 and T4 levels were lower than those in children with thyroid dysplasia, with statistically significant differences (P < 0.05), suggesting the thyroid morphology or functional changes associated with thyroid hormone levels of blood pressure, or we can preliminary judge by TSH and T4 levels with the cause. This evidence concerns the gene TG and hypothyroidism.