Oligomenorrhea : Signs, Causes, And How To Treat Oligomenorrhea is a condition characterized by infrequent or irregular menstrual periods. It can be concerning for individuals who experience it, as it may affect their reproductive health. There are various factors that can contribute to oligomenorrhea , including hormonal imbalances, stress, excessive exercise, drastic weight changes, thyroid disorders, and polycystic ovary syndrome (PCOS). Understanding the underlying cause of oligomenorrhea ... Oligomenorrhea is a condition in which you have infrequent menstrual periods. It occurs in women of childbearing age. Some variation in menstruation is normal, but a woman who regularly goes more ... The definition of oligomenorrhea is going 35 days or more between periods. Learn about the causes, symptoms, and treatment plans for oligomenorrhea today. Oligomenorrhea can be a result of prolactinomas (adenomas of the anterior pituitary). It may be caused by thyrotoxicosis, hormonal changes in perimenopause, Prader–Willi syndrome, and Graves' disease. Endurance exercises such as running or swimming can affect the reproductive physiology of female athletes. Female runners, [2][3] swimmers [4] and ballet dancers [5] either menstruate infrequently in comparison to non-athletic females of comparable age or exhibit amenorrhea. A more recent ...