Symptoms of low estrogen include decreased menstrual flow, decreased quality of sex life, menopausal syndrome, osteoporosis and so on. 1. Decrease in menstrual flow: Low estrogen level leads to thin endometrium and less endometrium shedding, so the menstrual flow decreases. 2. Decreased quality of sex life: lack of estrogen support in the vagina leads to vaginal dryness, which affects couples’ sex life. 3. Menopausal syndrome: Ovarian function fails during menopause and estrogen level is low, which is manifested as irritability, insomnia, hot flashes, anxiety and so on. 4. Osteoporosis: Low estrogen level will increase bone resorption and cause osteoporosis. When low estrogen occurs, consult a doctor in time and supplement estrogen correctly under the doctor’s guidance to reduce the occurrence of complications.