Low estrogen is related to factors such as decline in ovarian function, taking birth control pills, and lifestyle habits. 1. Decline in ovarian function: Entering menopause, undergoing repeated radiological examinations and repeated induced abortions will cause ovarian function to decline, resulting in a decrease in the ovary’s ability to secrete estrogen. 2. Taking contraceptive pills: long-term use of contraceptive pills will inhibit the secretion function of the ovaries, resulting in a decrease in estrogen levels. 3. Lifestyle habits: long-term dieting and weight loss cause excessive reduction of subcutaneous fat, resulting in a decrease or even loss of the function of fat cells to secrete estrogen. In addition, smoking, drinking and other bad habits can also cause estrogen levels to decrease. In the clinic, when estrogen level is found to be reduced, we should go to the hospital in time and follow the doctor’s instructions for treatment.