Thyroid stimulating hormone 64 µIU/mL is abnormal and high, which may be caused by primary hypothyroidism, subclinical hypothyroidism, pituitary tumor and other diseases, and it is recommended to improve the relevant examination. Thyroid stimulating hormone is secreted by the pituitary gland, and the normal range is between 0.35 and 5.5 µIU/mL, and the reference value range may be different in different hospitals. Therefore, a thyroid stimulating hormone of 64 µIU/mL is abnormal and high. There are many diseases that cause high thyroid stimulating hormone, such as primary hypothyroidism, subclinical hypothyroidism, pituitary tumor and other diseases, which need to be diagnosed together with thyroid hormone, imaging examination and other comprehensive diagnosis. It is recommended that patients with thyroid-stimulating hormone 64µIU/mL should consult a doctor in time, and cooperate with the doctor to improve other related examinations, to clarify the specific cause and then actively treat it.