The signs that menstruation is about to begin include abdominal cramping, bloating, head and muscle aches, and breast tenderness, according to WebMD. Some women also experience changes in mood and energy levels before the start of their monthly period.
These symptoms are associated with premenstrual syndrome, or PMS, which is caused by hormonal changes in the body, states WebMD. PMS symptoms usually occur around five to 10 days before the start of menstruation. Some women do not experience any symptoms of PMS. About 30 to 40 percent of women have PMS symptoms that are so severe that they interfere with normal daily activities. Women with severe PMS should tell their doctors, because many of the symptoms are treatable.