Oligomenorrhea is defined as irregular and inconsistent menstrual blood flow in a woman. Some change in menstrual flow is normal at menarche, postpartum, or in the perimenopausal period. But if a woman reports the length of menstrual cycle greater than 35 days or four to nine menstrual cycles in a year, then it is termed as oligomenorrhea.
Menstrual flow should be normal before the development of oligomenorrhea.[1]
Oligomenorrhea is often a sign of underlying disease. Following may be the causes of oligomenorrhea.
The prevalence of oligomenorrhea is 13.5 percent in the general population. A polycystic ovarian disease accounts for 4 to 10 percent of oligomenorrhea in women of reproductive age (from puberty to menopause). 11 to 44 percent of dancers and 6 to 60 percent of athletes report oligomenorrhea at some point in their life span.
History of oligomenorrhea includes a detailed history of menstruation, including duration of the menstrual cycle, the days of normal flow of menses in it, the number of pads used per day, the interval between two cycles, and the regularity of previous cycles. This information will give an idea about the amount of bleeding, the number of cycles in a year, and the regularity of menstrual cycles that will help to diagnose oligomenorrhea. Any irregularity of bleeding between menstrual cycles, hot flashes, and night sweats must be ruled out. The previous pattern of bleeding before the development of oligomenorrhea is important to know the baseline pattern of bleeding in the patient and the severity of change in that pattern.
Age of menarche, any sexual unprotected intercourse, abdomen pain, discharge, weight loss, are all necessary to determine the underlying cause. Any recent change in voice tone, hair growth, acne, blur vision, headaches, decreased libido, and production of milky discharge from nipples must be evaluated. Changes in bowel habits and skin also require evaluation.
Birth history is essential in this regard. It may indicate infertility or any history of dilatation and curettage.
In drug history, it is crucial to evaluate the use of birth control pills, antipsychotics, antiepileptics, and steroids.
Family history may show Turner syndrome or polycystic ovarian disease in first degree relatives.[11]
PHYSICAL EXAMINATION
Physical examination includes the following;
The external examination includes looking for any abnormal secondary sexual characteristics example, hair distribution, or clitoromegaly.
The rectovaginal examination includes inserting a gloved finger lubricated with anesthetic gel to examine the walls of the vagina and to feel for any anatomic obstruction or abnormalities, tenderness in the abdomen, mass in adnexa or abdomen.
Vaginal speculum examination includes looking into the vagina and cervix with the use of a speculum. Look for any abnormal discharge, signs of inflammation, and growths.
Abdomen examination includes inspection of the abdomen for ascites. Palpate the abdomen for masses and tenderness. Palpate the groin for inguinal lymphadenopathy.
Labs to evaluate the cause of oligomenorrhea includes the following:
Blood Tests
Investigations
Treatment of oligomenorrhea mainly depends on the underlying cause;
Lifestyle Changes
Oligomenorrhea, when caused by low basal metabolic index and stress levels, can be dealt with behavior modification, diet, psychotherapy, and stress reduction techniques. Anovulation, when caused by obesity, can be managed with weight reduction.
Hormonal Therapy
Birth control pills are often used to restore the regularity of the menstrual cycle, especially in Polycystic ovarian disease. They are safe to use, especially when the patient does not desire pregnancy.
Treating The Underlying Medical Conditions
If hyperthyroidism is the cause, then it is treated with antithyroid drugs, radioactive iodine or thyroidectomy. If the etiology is Cushing syndrome, then it is treated with medication that blocks excess cortisol overproduction example, ketoconazole, mitotane, and metyrapone. Prolactinomas, if small, can be treated with dopamine agonists example, bromocriptine, and cabergoline.
Surgical Management
Menarche
Menarche is the first menstrual cycle in females. Its average age in the USA is 12.5 years. Girls may undergo initial anovulatory cycles that may cause light or irregular mensural flow that becomes regular overtime, which can be confused with oligomenorrhea, where initially women have established regular flow, and it gets lighter later on.
Perimenopause
The irregular bleeding of perimenopause may be confused with oligomenorrhea, but mostly it is associated with accompanying sign and symptoms like hot flashes, vaginal dryness, night sweats, weight gain, mood changes and vaginal pain with intercourse whereas oligomenorrhea due to another medical condition will not be associated with such sign and symptoms.
Irregular Bleeding
Irregular bleeding may be confused with oligomenorrhea. Irregular bleeding is bleeding between cycles. It may indicate an endometrial polyp in premenopausal women or endometrial cancer in postmenopausal women.
Pregnancy
It is crucial to make sure that cause of a delayed menstrual cycle is not a pregnancy. A pregnancy test is used for this purpose. A pregnancy test checks the urine or blood for a hormone called human chorionic gonadotropin (HCG).
A small herbal medicine randomized controlled trial for oligomenorrhea and polycystic ovarian disease suggested that the individualized and standardized herbal medicine both have similar profiles in terms of safety and clinical effects in helping menstrual regularity.[16]
Oligomenorrhea itself is not a serious problem, but its underlying cause must be evaluated to avoid infertility. Moreover, if left untreated, it can increase the risk of endometrial hyperplasia and endometrial cancer.
Patients must note the date of their menstrual cycle every month and observe for any irregularity in the cycle or changes in the amount of bleeding during the cycles. Any sudden change must be noted. Patients must understand the normal physiology of the menstrual cycle and when to contact a doctor. A woman should contact a gynecologist if she goes more than 35 days without a period. All this education will help the patient to seek timely advice from the doctor.
Regarding the use of birth control pills that are often used to maintain regularity of menstrual cycles in oligomenorrhea, patients must receive counsel regarding taking their medication regularly with fixed timings every day to increase its efficacy and to avoid withdrawal bleeding due to noncompliance of drugs. Patients must understand that they should not expect a pregnancy during the usage of drugs. If they desire a pregnancy, then alternative options for treatment must be explored.
The multidisciplinary team approach that can improve outcomes in patients with oligomenorrhea includes a gynecologist to address the underlying cause of oligomenorrhea, a nutritionist to manage the weight of the obese patients, and a psychotherapist that will help women to cope with the mental pressure of delay or inability to conceive a child. An endocrinologist is required to address the cause of diabetes mellitus and hyperthyroidism to improve the outcome of patients with oligomenorrhea.
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