Period pain is common and most often normal for women. It is caused by contractions of the womb which is more often and stronger during menstruation. It can be also caused by medical conditions which is less common.
Medical conditions that can cause painful periods are:
These conditions can be diagnosed by a detailed transvaginal ultrasound scan. It is not uncommon for a woman to suffer for years before the above conditions diagnosed by a detailed and advanced ultrasound scan.