This excreted uterine lining is the menstrual flow. This cycle is repeated about every 28 days. The amount of time between menstruation may vary from woman to woman and month to month. Any duration between periods from 19 to 35 days is considered normal. A woman who is menstruating may have no symptoms other than bleeding for three to seven days.
Some women experience some difficulties with their menstruation.
Some feel down or blue right before their periods begin. Others find that hair and skin becomes oily. Others have cramps when their periods begin. Some women have PMS, or premenstrual syndrome . A woman with PMS may have bloating, breast soreness, swelling, fatigue , or irritability for up to two weeks before her period begins.