For 3 to 6 days each month, all this stuff flows out of your body through your vagina as reddish-brown menstrual flow. Skipping ahead about 40 years, when your body enters menopause, your ovaries stop producing eggs and your periods stop. Your period may be irregular through the first year or two. Other causes of irregularity may be stress, a change in your diet or an increase in exercise , or drug use. If none of these apply to you, or if you're still concerned, check with your physician.
Some women feel moody, anxious or depressed for several days before their period.
Other symptoms may include headaches, backaches, pimples, nausea and food cravings. Remember, not everyone experiences these difficulties, but for the women who do, they're very real. They're due to the hormonal changes that take place prior to menstruation. Never fear, PMS symptoms will disappear when your period begins. The emotions and problems that seemed overwhelming suddenly feel manageable.