TSH0.006μIU/ml is lower than normal value, T3, T4 is normal, TSH is low may be the case of subacute thyroiditis, but also need to thyroid function test and clinical manifestations to further determine. T3 is triiodothyronine amino acid, T4 is thyroxine, TSH is thyrotropin, all are important indicators to check the function of the thyroid gland.T3, T4 is normal, TSH is low, if ultrasound found that there is destruction of the thyroid gland, thyrotropin receptor abnormality and other test results, and the patient has symptoms such as muscle pain, fever, sweating and so on, it can be considered as subacute thyroiditis. It is recommended that the patient go to the hospital in time, after clarifying the cause of the disease, symptomatic treatment, so as not to delay the condition.