Low thyroid hormone is often caused by the following diseases: chronic thyroiditis, hypothyroidism, Hashimoto’s thyroiditis, hypothyroidism, etc. Thyroid hormone is secreted by the thyroid gland and is an important hormone for maintaining the normal physiological function of the human thyroid gland. Low thyroid hormone In addition to the above common diseases, patients with hyperthyroidism who are in the hyperthyroid phase may also have symptoms of low thyroid hormone. Damage to the pituitary gland can also cause low thyroid hormone. Hypothalamic pituitary disease can secrete thyrotropic hormone, and when it is damaged it can cause a decrease in thyrotropic hormone, which then leads to a decrease in thyroid hormone secretion. In addition, common clinical medications such as aspirin and glucocorticoids can also cause low thyroid hormone. Low thyroid hormone can cause weakness in the limbs, dizziness, panic attacks and other symptoms.