Final answer:
Estrogen has different effects at low vs. high levels in women. At low levels, it can cause symptoms such as hot flashes, vaginal dryness, and mood swings. At high levels, it can have beneficial effects such as reducing the risk of heart attack and maintaining vaginal health.
Step-by-step explanation:
Estrogen has different effects at low vs. high levels in women. At low levels, estrogen can cause symptoms such as hot flashes, night sweats, trouble sleeping, vaginal dryness, mood swings, difficulty focusing, and thinning of hair on the head. It can also lead to health issues like abnormal growth of the endometrium and increased risk of developing endometrial cancer. At high levels, estrogen can have beneficial effects such as reducing the risk of heart attack and maintaining the elasticity, strength, and thickness of the vaginal wall. It can also prevent atherosclerosis by increasing the levels of HDL and LDL in the blood.