The five thyroid indicators, including T3, T4, TSH, FT3, FT4, of which FT3 and FT4 are free T3 and T4, are more responsive to disease and are mostly seen in tests such as hyperthyroidism or hypothyroidism. If primary hyperthyroidism is found, it generally shows elevated T3 and T4 and decreased TSH, as well as elevated FT3 and FT4, of which T3 is more sensitive than T4. If hypothyroidism occurs, it generally manifests as lower T3 and T4, along with elevated TSH. Regardless of whether hyperthyroidism or hypothyroidism occurs, you need to go to the hospital for examination and medication.