The causes of low estrogen in women include: First, low estrogen levels due to ovarian secretion, which is influenced by the hypothalamus-pituitary endocrine function, and abnormalities in the function of the gonadal secretion axis can lead to low estrogen. When women suffer from endocrine disorders, such as hypothyroidism and hyperthyroidism, it will also lead to low estrogen levels. When women are in menopause, their estrogen level will also be low due to reduced ovarian function or atrophy. When women have low estrogen levels, if they are in their reproductive age, they need to have a sex hormone test to clarify the cause and treat the problem. If they are suffering from endocrine disorders, they need to actively treat the primary disease.