Estrogen is secreted by the ovaries and the placenta, which can promote the development of female secondary sex characteristics and the maturation of sexual organs. Low estrogen secretion may be caused by physiological or pathological reasons: I. Physiological reasons: When women reach menopause, the function of the ovaries gradually declines, so the role of synthesizing and secreting estrogen is correspondingly weakened, or it may be due to the incomplete development of the ovaries during puberty, premature ovarian failure, etc., which leads to the secretion of estrogen by the ovaries Less, low estrogen level. Pathological causes: 1, abnormal hypothalamic function: some women have reduced secretion of gonadotropins from the cerebral cortex when symptoms such as mental tension, emotional changes, environmental changes, and rapid weight loss occur, resulting in reduced secretion of follicle-producing hormone and follicle-stimulating hormone and ultimately lower estrogen; 2, abnormal pituitary function: some women suffer from pituitary tumors, hyperprolactinemia, and other diseases that can inhibit the pituitary 3. Ovarian diseases: some ovarian diseases such as polycystic ovary syndrome and ovarian cysts affect ovarian function, resulting in reduced estrogen secretion; 4. Gestational hypertension syndrome: when some pregnant women suffer from hypertension, it can lead to lower estrogen. Estrogen has an important impact on the endocrine system, cardiovascular system, metabolic system, growth of bones and maturation of skin, etc. Once there is a lack of estrogen, it needs to be supplemented in a timely manner under the assessment and guidance of a specialist.