TSH 66.6mIU/L indicates elevated thyroid stimulating hormone. Elevated TSH secretion can be seen in hypothyroidism (hypothyroidism), pituitary lesions and other diseases. 1. Hypothyroidism: Due to hypothyroidism caused by various reasons, T3 and T4 in the blood circulation drop, the inhibitory effect on TSH secretion by the pituitary gland disappears, and TSH is secreted in large quantities, so it is necessary to treat hypothyroidism under the guidance of a doctor. 2. Pituitary lesions: such as adenopituitary hyperfunction, pituitary tumors, etc., leading to elevated TSH, may require surgical treatment. There are many reasons for TSH elevation, so it is recommended that patients go to the endocrinology department, complete the relevant examinations, and choose the most appropriate treatment plan according to the cause under the guidance of the doctor.