What can cause an irregular menstrual period?

Hormones: Irregular menstrual periods (defined as menstrual bleeding that comes at irregular times) is almost always hormonal. However, the hormonal abnormalities are generally the result of a variety of abnormalities such as ovarian dysfunction, pituitary dysfunction, thyroid dysfunction, adrenal dysfunction, or in many, many cases ......Obesity. Can have adverse health consequences, get checked out.