Irregular menses are very common and we look at some of the major causes:
Contraceptives: According to Pauline, a medic with the Aga Khan University Hospital, some birth control methods can cause irregular menses. This however varies from individuals as bodies react differently to different contraceptives.
Stress: Research by https://draxe.com/irregular-periods/ shows that when you’re under a lot of stress for an ongoing period, your body can start to conserve energy by preventing ovulation. Experiencing a traumatic event, or even a lot of “ordinary” stress, can suddenly cause the adrenals to work overtime, which can disrupt the production of thyroid hormones, estrogen and other reproductive hormones.
Climate or environment change: Bodies tend to behave in a certain way to specific/certain environments. Hence if you move from one environment to another, your body may react in a particular way which in return affects your menstrual flow.
Excessive weight loss or gain: This could contribute to irregular menses in women. Although low body weight is a common cause of missed or irregular periods, obesity also can cause menstrual problems. http://www.webmd.com/women/
Breastfeeding: Weaning mothers may experience irregular menses. Some women experience irregular menses till they finish breastfeeding then it goes back to normal.
Endometriosis: Women with endometriosis tend to have very heavy periods. Some may also have very painful periods, while others don't experience pain at all. Since the condition usually develops a few years after a girl's first period, those suffering from it may just think their periods are normal. In some women, endometriosis tissue may build up or even spread over time, which can amplify symptoms and cause periods to become more painful or heavier than usual. The condition can also cause spotting, according to the Mayo Clinic. https://www.self.com/