It is normal to feel strong menstruation but not to come, this is considered premenstrual syndrome, before the onset of menstruation will appear breast pain, abdominal pain, abdominal distension, but also cause mood irritability and other symptoms, this is caused by hormonal changes in the body before the onset of menstruation, after the onset of menstruation will disappear, you can observe to see. If your period is delayed for more than a week, it is normal. If your period is delayed for more than a week, it may be caused by endocrine disorders, gynecological inflammation, stressful life, etc. Also, taking birth control pills can cause delayed periods. If you have intercourse during ovulation and do not take contraceptive measures, consider pregnancy to cause delayed menstruation, abdominal pain, chest distension and other sensations, you can go to the hospital for an early pregnancy test. After ruling out pregnancy, you can check the hormone six items to rule out endocrine disorders, and after identifying them, make reasonable adjustments.