Amenorrhea (Absence of Menstruation)
Amenorrhea is the medical term for the absence of menstrual periods. It means that a girl or woman does not have menstrual bleeding when it would normally be expected. Amenorrhea is not a disease by itself but may be a sign of an underlying medical, hormonal, nutritional, reproductive, or lifestyle-related condition. Missing a period can sometimes occur temporarily due to normal life events such as pregnancy or breastfeeding. However, persistent or unexplained absence of menstruation should be evaluated by a healthcare professional. There are two main types of amenorrhea:
Primary amenorrhea refers to the absence of the first menstrual period (menarche) in an adolescent girl. Medical evaluation is generally recommended if menstruation has not started by around age 15, or if there are other signs of delayed puberty.
Secondary amenorrhea occurs when a woman who previously had menstrual periods stops having them for three months or longer when her periods were previously regular, or for about six months when her periods were irregular.
Pregnancy is one of the most common natural causes of secondary amenorrhea in women of reproductive age.
The main symptom of amenorrhea is absence of menstrual periods. Depending on the underlying cause, other symptoms may occur, including:
- Acne
- Changes in breast size
- Breast tenderness
- Hair loss or thinning hair
- Increased facial or body hair growth
- Headache
- Milky discharge from the nipples when not breastfeeding
- Pelvic pain
- Unexplained weight gain or weight loss
- Hot flashes or night sweats
- Vaginal dryness
- Changes in sexual desire
- Vision changes
- Excessive fatigue
The symptoms can vary considerably depending on whether the cause is related to the ovaries, uterus, pituitary gland, thyroid gland, nutrition, medications, or another condition.
Amenorrhea can have many different causes. Some are temporary and normal, while others may require medical treatment.
- Pregnancy
- Breastfeeding
- Menopause
- Polycystic ovary syndrome (PCOS)
- Thyroid disorders
- Premature ovarian insufficiency (early loss of normal ovarian function)
- High levels of testosterone or other androgens
- Disorders affecting the hypothalamus or pituitary gland
- Pituitary tumors
- Certain genetic or chromosomal conditions, including Turner syndrome
- Congenital abnormalities of the reproductive system
- Müllerian abnormalities
- Low body weight
- Rapid or significant weight loss
- Poor nutrition or malnutrition
- Excessive physical exercise
- Significant mental or emotional stress
- Certain eating disorders
Certain medicines can affect menstrual cycles and may cause amenorrhea. These can include some:
- Antipsychotic medications
- Antidepressants
- Cancer chemotherapy medicines
- Blood pressure medicines
- Other medicines that affect hormone levels
Hormonal contraceptives, including some birth-control pills, injections, implants, and intrauterine devices (IUDs), can also alter or stop menstrual bleeding in some women.
Problems involving the reproductive organs may also prevent normal menstrual bleeding. These can include:
- Uterine scarring
- Abnormal development of the uterus
- Abnormalities of the cervix
- Structural abnormalities of the vagina
- Congenital abnormalities of the reproductive tract
Certain factors may increase the likelihood of developing amenorrhea. These include:
- Very low or very high body weight
- Intense athletic training
- Significant psychological stress
- A history of menstrual irregularities
- PCOS
- Thyroid disorders
- Certain medications
- Hormonal contraceptive use
- A family history of early menopause or certain reproductive disorders
- Certain genetic or chromosomal conditions
A doctor will usually begin by asking about the patient’s menstrual history, medical history, medications, diet, exercise habits, weight changes, and other symptoms. In women and girls of reproductive age, a pregnancy test is commonly performed first when appropriate. Depending on the suspected cause, investigations may include:
- Physical and pelvic examination
- Pregnancy test
- Blood tests to check hormone levels
- Thyroid function tests
- Prolactin testing
- Tests for ovarian and reproductive hormones
- Androgen or testosterone testing when indicated
- Pelvic ultrasound
- Other imaging tests when necessary
- MRI of the brain or pituitary gland in selected cases
- Genetic or chromosomal testing in certain cases of primary amenorrhea
The specific tests depend on the person’s age, symptoms, menstrual history, and suspected underlying condition.
Treatment depends on the underlying cause. There is no single treatment that is appropriate for every person with amenorrhea. Possible treatments may include:
- Treating an underlying thyroid or hormonal disorder
- Managing PCOS and associated metabolic or hormonal problems
- Improving nutrition and achieving a healthy body weight
- Reducing excessive exercise when it is contributing to menstrual suppression
- Addressing significant psychological stress
- Changing or adjusting medicines when medically appropriate
- Hormonal therapy in selected patients
- Treatment for premature ovarian insufficiency when appropriate
- Surgical treatment for certain structural abnormalities or reproductive tract problems
A doctor should determine the appropriate treatment after identifying the cause.
Amenorrhea can sometimes affect fertility because the absence of menstrual periods may indicate that ovulation is not occurring normally. However, amenorrhea does not necessarily mean permanent infertility. Fertility may return when the underlying cause is treated or corrected. Women who are trying to become pregnant and have absent or irregular periods should discuss their situation with a gynaecologist or fertility specialist.
The complications of amenorrhea depend on its underlying cause and how long it continues. Possible complications may include:
- Difficulty becoming pregnant
- Reduced bone density or osteoporosis when estrogen levels remain low for a prolonged period
- Increased risk of bone fractures
- Psychological or emotional distress
- Complications associated with an underlying hormonal or metabolic disorder
Long-term absence of menstruation should therefore not be ignored, particularly when it is unexplained.
A healthcare professional should be consulted if:
- Menstruation has not started by the expected age
- Previously regular periods stop for three months or more
- Periods become persistently irregular
- Amenorrhea occurs along with significant weight loss or weight gain
- There is excessive facial or body hair growth or severe acne
- There is nipple discharge unrelated to breastfeeding
- There are persistent headaches or vision changes
- There is pelvic pain
- Pregnancy is possible
- There are symptoms suggesting a hormonal disorder
Sudden severe pelvic or abdominal pain, fainting, or heavy bleeding requires prompt medical attention, particularly if pregnancy is possible.
The primary specialist for evaluation of amenorrhea is a:
- Gynaecologist and Obstetrician
Depending on the suspected cause, a doctor may also recommend consultation with an endocrinologist, reproductive medicine specialist, or other appropriate specialist.
No. Amenorrhea means menstrual periods are absent for a prolonged period, whereas irregular periods refer to menstrual cycles that occur at unpredictable intervals or vary significantly in length.
Yes. Significant physical or emotional stress can interfere with the hormones responsible for ovulation and menstruation and may lead to temporary absence of periods.
Yes. Being significantly underweight, losing weight rapidly, or not getting adequate nutrition can disrupt reproductive hormone production and cause amenorrhea.
Yes. Very intense exercise, particularly when combined with inadequate calorie intake or low body fat, can interfere with normal reproductive hormone function.
Yes. PCOS can interfere with normal ovulation and may result in infrequent or absent menstrual periods.
In many cases, yes. Treatment depends on the underlying cause. Correcting nutritional problems, treating hormonal disorders, modifying certain lifestyle factors, or using appropriate medical or surgical treatment may help restore menstruation.
No. Pregnancy is an important cause of missed periods in women of reproductive age, but many other conditions can also cause amenorrhea. A pregnancy test is generally recommended when pregnancy is possible.
It can. Some causes of amenorrhea prevent regular ovulation and may make it difficult to become pregnant. Treating the underlying cause may restore ovulation and improve fertility in some women.
Medical Disclaimer: This article is intended for general educational and informational purposes only. It should not be considered a substitute for professional medical advice, diagnosis, or treatment. Anyone experiencing persistent or unexplained absence of menstrual periods should consult a qualified healthcare professional.
