The human thyroid gland is shaped like a butterfly and is located in the neck below the thyroid cartilage (often called the "Adam's apple") and in front of the trachea.

Both hyperthyroidism or hypothyroidism are very harmful to the human body. However, in terms of the difficulty of treatment and the side effects of treatment drugs, hypothyroidism is comparatively easy to deal with.

During perimenopause, women may experience physical and psychological discomfort due to fluctuations or decreased levels of sex hormones. In addition to menstrual disorders such as irregular menstrual cycles, delayed menstruation, and increasing or decreasing menstrual volume until menopause, the main symptoms include a series of vasoconstrictive and neuropsychiatric symptoms, such as hot flashes, sweating, irritability, anxiety, emotional, palpitations, and insomnia. These are the perimenopausal syndrome, also commonly known as menopausal syndrome.