Hypothyroidism is short for “hypothyroidism”. Hypothyroidism is a systemic disease caused by insufficient synthesis or physiological effects of thyroid hormones. It is usually caused by primary (thyroid-related) hypothyroidism, which is caused by a variety of factors that lead to lesions of the thyroid gland itself, such as after anti-thyroid medication, after surgery for thyroid disease, after radioactive iodine treatment for hyperthyroidism, congenital thyroid deficiency, Hashimoto’s thyroiditis, aggressive fibrous thyroiditis, congenital thyroid hormone synthesis disorder, etc. Rarely, it is secondary (pituitary) hypothyroidism, which is caused by pituitary disorders that reduce TSH secretion, such as after pituitary tumors, pituitary surgery or radiation therapy. The clinical manifestations of hypothyroidism are related to the degree of thyroid hormone deficiency. Common manifestations include fatigue, frequent sleepiness (drowsiness), feeling cold all the time (fear of cold), easy paralysis or muscle pain in the extremities, decreased appetite with more significant weight gain, constipation, dry and brittle skin, hair or nails, depressed or depressed mood, and generalized swelling. According to the serum test results, hypothyroidism is usually divided into clinical hypothyroidism and subclinical hypothyroidism: if the free T3 (FT3) and free T4 (FT4) measurements are below the lower limit of the normal value, and the supersensitive thyrotropin (STSH) measurement is above the upper limit of the normal value, it is clinical hypothyroidism; if the FT3 and FT4 values are in the normal range, but the STSH is above the upper limit of the normal value, it is subclinical hypothyroidism. Hypothyroidism is a relatively simple disease to treat, as long as the appropriate amount of thyroxine (the best is levothyroxine – such as “Eugenol”) is supplemented under the guidance of a doctor, you can maintain normal thyroid function. Once the hypothyroidism is corrected, the clinical symptoms caused by hypothyroidism will gradually disappear. In your mother’s case, it is recommended to go to a qualified hospital for further examination to clarify the cause of hypothyroidism and the presence of other related diseases, so as to determine the correct treatment plan.