Elevated levels of estrogen can cause symptoms such as bloating, headaches, mood swings, swelling or tenderness of the breasts, and lack of energy. High estrogen levels can also increase the risk of breast and endometrial cancer, reports Healthline.
Estrogen is important in regulating a woman's menstrual cycle. High levels of estrogen may increase the symptoms of premenstrual syndrome or cause irregular or missed periods. Some women with elevated levels of estrogen experience decreased sex drive. Excessive estrogen in the body can also cause weight gain and hair loss. Memory and sleep are impacted by elevated estrogen levels as well, according to Healthline.