Menopause is when you haven't had a period for 12 months and aren't pregnant or sick. It's a normal part of aging and usually happens in your 40s or 50s. Symptoms include hot flashes, night sweats, irregular periods, vaginal dryness, mood swings, sleep problems, body changes, and drop in sexual function. These changes are due to a natural decrease in female sex hormones as you age. If you have symptoms that affect your daily life, talk to your doctor about treatment options including lifestyle changes and medication.