Hormones play a part in everything from the way our brain functions to our sex drive and cholesterol levels. So it's not surprising to learn that when menopause throws off this delicate balance of estrogen and progesterone, our body reacts by going a little — or a lot — haywire. As a result, you might experience symptoms such as hot flashes, insomnia, night sweats or vaginal dryness. Some people also experience difficulty concentrating, weight gain, mood swings or depression around the same time. It's hard to say if these are due to aging or menopause, but lifestyle changes can make a big difference.