Menstruation delays a week abdomen dull ache how to return a responsibility

Menstruation delay a week small abdomen dull pain, may be caused by menstruation is about to come, may also be pregnancy, cold, improper diet caused, but also does not rule out endometriosis, endometriosis and other inflammation caused, you need to go to the hospital to do abdominal B ultrasound examination to confirm the specific cause.