TSH is thyroid stimulating hormone, the normal value for adults is 0.35~5.5mU/L, and the reference value may be different in different hospitals.TSH 0.01mU/L is low, which needs to be diagnosed together with other tests such as thyroid hormone, and may not have any symptom, or there may be hyperthyroidism symptoms such as hand trembling, irritability, etc, or hypothyroidism symptoms such as fear of cold, and mucus oedema. 1. Subclinical hyperthyroidism: If the patient’s TSH is low, but T3 and T4 are normal, it suggests that the patient may have subclinical hyperthyroidism. The patient may have no obvious symptoms, or may have weakness, fever and other mild hyperthyroidism symptoms. 2. Hyperthyroidism: If the patient’s TSH is low and T3 and T4 are elevated, it suggests that the patient may be suffering from hyperthyroidism. The patient may have symptoms such as eye protrusion, fatigue, diarrhea, fast heart rate, hand tremor, fever, irritability, etc., and serious symptoms such as coma and shock may occur. 3. Hypothyroidism: If the patient’s TSH, T3 and T4 are reduced, it suggests that the patient may be suffering from hypothyroidism. The patient may have symptoms such as indifference, fear of cold, and mucous edema. It is recommended that patients with abnormal TSH test values should go to the hospital in time for treatment.