Amenorrhea

Overview

Amenorrhea is the absence of menstrual periods in a woman who should be menstruating. This condition can occur in two different ways: primary amenorrhea and secondary amenorrhea.

Primary amenorrhea is when a girl has not had her first menstrual period by age 15. Secondary amenorrhea is when a woman who has previously had regular or irregular periods stops menstruating for 3 months or longer, when she is not pregnant.

Amenorrhea is not a disease itself but rather a symptom of an underlying condition. It is normal not to menstruate during pregnancy, breastfeeding, and menopause. However, outside of these periods, amenorrhea can signal hormonal imbalances, ovarian problems, structural uterine abnormalities, or pituitary gland dysfunction.

If left untreated, amenorrhea can lead to some complications. Estrogen deficiency can cause bone loss (osteoporosis). The absence of periods can also indicate fertility problems and, if untreated, can make it difficult to conceive. Some causes of amenorrhea may increase the risk of uterine cancer in the long term.

Treatment varies depending on the underlying cause. Hormonal imbalances can be corrected with medications, structural problems can be resolved with surgery, and lifestyle changes can restore menstrual regularity in some cases. Early diagnosis and appropriate treatment are important for both physical and emotional health.

Most women with amenorrhea can return to normal menstrual cycles with treatment. However, each woman's situation is different and requires a personalized treatment approach.

Symptoms of amenorrhea

The main symptom of amenorrhea is the absence of menstrual bleeding. However, depending on the underlying cause, other symptoms may accompany it.

• Absence of menstrual periods. In primary amenorrhea, menstruation has never started by age 15. In secondary amenorrhea, a woman who has previously menstruated stops having periods for 3 months or longer, outside of pregnancy, breastfeeding, or menopause. This is a symptom in itself, but understanding the cause requires attention to other signs.
• Milky nipple discharge (Galactorrhea). Milk-like discharge from the nipples in a woman who is not pregnant or breastfeeding can indicate excess prolactin hormone from the pituitary gland. Elevated prolactin prevents ovulation and causes amenorrhea. This condition may be due to a pituitary tumor called prolactinoma or a side effect of certain medications.
• Excessive hair growth (Hirsutism). Increased male-pattern hair growth on the face, chest, back, or abdominal area can indicate high androgen (male hormone) levels. This condition may be a sign of polycystic ovary syndrome (PCOS) or adrenal gland disorders. Acne, hair loss, and voice deepening may also occur.
• Hot flashes and night sweats. Women with estrogen deficiency may experience menopause-like symptoms. Sudden feelings of heat, flushing, and excessive sweating at night can be signs of premature ovarian insufficiency or premature menopause. These symptoms are generally considered abnormal in women under age 40.
• Vaginal dryness. Estrogen deficiency causes thinning and dryness of vaginal tissue. This condition can lead to pain or discomfort during sexual intercourse. Decreased libido may also accompany it. In young women, these symptoms indicate hormonal imbalance.
• Headaches and vision problems. In women with a pituitary tumor (usually benign prolactinoma), as the tumor grows, it can press on the optic nerves. This condition causes headaches, double vision, or peripheral vision loss. These symptoms require urgent medical evaluation because untreated pituitary tumors can lead to permanent damage.
• Weight changes. Rapid weight loss or very low body weight (especially in eating disorders) can cause amenorrhea. Conversely, rapid weight gain and obesity are common in PCOS. When the body perceives insufficient energy reserves (in athletes or anorexia nervosa), it disrupts hormonal regulation and stops the menstrual cycle.
• Acne and oily skin. Women with excess androgens experience increased skin oiliness and acne problems. This is one of the common symptoms of PCOS. It usually occurs along with hirsutism and weight gain.
• Pelvic pain. In some structural problems (uterine or vaginal abnormalities), menstrual blood can accumulate and cause pelvic pain. There may be cramping pain as if menstruation is occurring, but no bleeding. This condition results from anatomical problems such as imperforate hymen (hymen has no opening) or cervical stenosis (closed cervix).

When to See a Doctor

You should definitely see a doctor in the following situations:

If menstruation has not started by age 15 or if secondary sexual characteristics (breast development, hair growth) have not begun by age 13, primary amenorrhea evaluation is needed. If breast development is present at age 16 but menstruation has not occurred, evaluation should be done.

If a woman with previously regular periods has not menstruated for 3 months (if not pregnant), she should see a doctor for secondary amenorrhea. Make sure the pregnancy test is negative.

If there is milky discharge, excessive hair growth, severe acne, vision problems, or headaches, these may be signs of serious hormonal disorders. Early evaluation is important.

If you are trying to conceive and have irregular or absent periods, seek fertility evaluation immediately. Early treatment increases the chance of pregnancy.

Causes of amenorrhea

Amenorrhea has many different causes. Natural causes, hormonal imbalances, structural problems, and lifestyle factors can lead to amenorrhea.

• Pregnancy and breastfeeding. Pregnancy is the most common and natural cause of secondary amenorrhea. It is also normal not to menstruate during the breastfeeding period after childbirth because prolactin hormone suppresses ovulation. Depending on the duration and frequency of breastfeeding, some women may not menstruate for months or years. This is a completely natural process and should not cause concern.
• Menopause. Menopause usually occurs between ages 45-55 and periods stop because the ovaries stop producing eggs. During the transition to menopause (perimenopause), periods become irregular and eventually stop completely. Menopause is a natural aging process. However, if periods stop before age 40, this may be premature menopause (premature ovarian insufficiency) and requires treatment.
• Polycystic ovary syndrome (PCOS). PCOS is the most common hormonal disorder in women of reproductive age and one of the frequent causes of secondary amenorrhea. In PCOS, numerous small cysts form in the ovaries, androgen hormones increase, and ovulation becomes irregular or stops completely. PCOS symptoms include irregular periods or amenorrhea, excessive hair growth, acne, weight gain, and infertility. PCOS also increases insulin resistance and type 2 diabetes risk.
• Pituitary gland problems. The pituitary gland is located in the brain and regulates reproductive hormones (FSH, LH). A pituitary tumor (usually benign prolactinoma) secretes excess prolactin hormone, which prevents ovulation and causes amenorrhea. Sheehan syndrome is damage to the pituitary gland due to severe blood loss during childbirth and leads to amenorrhea. Radiation therapy or surgery to the pituitary gland can also impair its function.
• Thyroid disorders. Overactivity (hyperthyroidism) or underactivity (hypothyroidism) of the thyroid gland can affect the menstrual cycle. Hypothyroidism in particular can cause irregular periods and amenorrhea. Thyroid hormones interact with reproductive hormones; therefore, normal thyroid function is important for regular menstruation.
• Premature ovarian insufficiency (Early menopause). Ovaries stopping egg production in women under age 40 is an abnormal condition. Genetic factors, autoimmune diseases, chemotherapy, or radiation therapy can cause premature ovarian insufficiency. Symptoms resemble menopause symptoms: hot flashes, night sweats, vaginal dryness, and infertility. Early diagnosis and estrogen treatment reduce the risk of bone loss.
• Structural or anatomic problems. Some women may be born without a uterus or vagina (Mayer-Rokitansky-Küster-Hauser syndrome). Imperforate hymen (hymen has no opening) prevents menstrual blood from exiting; a painful pelvic mass forms. Asherman syndrome is the formation of adhesions or scar tissue inside the uterus (usually after curettage or infection); this prevents thickening of the uterine lining and menstrual bleeding.
• Excessive exercise and low body fat. Amenorrhea is common in women who exercise intensively, such as professional athletes, ballerinas, and marathon runners. When body fat percentage is very low (generally below 15-17%), the brain perceives insufficient energy reserves and suppresses reproductive functions. This is known as "athletic amenorrhea" or "hypothalamic amenorrhea." Periods usually return when exercise amount is reduced and weight is gained.
• Eating disorders. Eating disorders such as anorexia nervosa and bulimia nervosa cause severe weight loss and nutritional deficiency. The body enters starvation mode and stops secreting reproductive hormones. Excessive weight loss, low body fat, and inadequate nutrition lead to hypothalamic amenorrhea. If left untreated, there is increased risk of bone loss, heart problems, and infertility.
• Stress and psychological factors. Chronic intense stress, trauma, depression, or anxiety disorders can affect the menstrual cycle. The stress hormone cortisol disrupts the regulation of reproductive hormones and can prevent ovulation. Stress-related amenorrhea is usually temporary and periods return when stress decreases. However, chronic stress can cause long-term amenorrhea.
• Medications. Some medications can cause amenorrhea. Antipsychotics and some antidepressants increase prolactin levels. Chemotherapy drugs can damage the ovaries. After stopping birth control pills, it may take months for periods to return in some women (post-pill amenorrhea). Long-acting birth control methods (Depo-Provera injections) can also cause amenorrhea.
• Obesity. Excess weight and obesity can lead to hormonal imbalance. Adipose tissue produces estrogen; excess adipose tissue increases estrogen levels in an unbalanced way and disrupts the ovulation cycle. Obesity also increases insulin resistance and PCOS risk. Healthy weight loss can restore menstrual regularity in many obese women.
• Congenital adrenal hyperplasia. This genetic condition causes the adrenal glands to produce excess androgens (male hormones) instead of cortisol. High androgen levels prevent ovulation and lead to amenorrhea. Excessive hair growth, acne, and genital ambiguity (in severe cases) may also be seen.

Complications of amenorrhea

Untreated amenorrhea can lead to various health problems. Complications depend on the cause and duration of amenorrhea.

• Osteoporosis (Bone loss). Estrogen hormone maintains bone density. In prolonged amenorrhea, estrogen deficiency accelerates bone loss and osteoporosis can develop even at a young age. Bones become brittle and fracture risk increases. Premature ovarian insufficiency, hypothalamic amenorrhea, and prolonged breastfeeding negatively affect bone health. Estrogen therapy and calcium-vitamin D supplementation can slow bone loss.
• Infertility. Amenorrhea usually means that ovulation is not occurring. Without ovulation, it is not possible to conceive naturally. PCOS, pituitary disorders, and premature ovarian insufficiency lead to infertility. With treatment, ovulation can be stimulated and many women can become pregnant. However, in some cases (such as early menopause), assisted reproductive technologies may be needed.
• Cardiovascular problems. Estrogen protects heart and vascular health. Long-term estrogen deficiency can increase heart disease risk. Women with early menopause are at particularly high risk. Cholesterol levels may become imbalanced and vascular stiffness may increase. Estrogen replacement therapy can help reduce this risk.
• Endometrial hyperplasia and cancer risk. In chronic ovulatory disorders such as PCOS, estrogen is secreted but progesterone is not. This imbalance can cause excessive thickening of the uterine lining (endometrium) (hyperplasia). If left untreated, endometrial hyperplasia increases uterine cancer risk. Regular progesterone therapy or birth control pills reduce this risk.
• Pelvic pain and infection risk. In structural problems (imperforate hymen, closed cervix), menstrual blood accumulates and increases the risk of pelvic infection (hematometra, hematocolpos). This condition can lead to severe pain and fertility problems. Surgical correction is usually necessary.
• Psychological effects. Amenorrhea can cause anxiety, depression, and self-esteem issues, especially in young women. Infertility concerns, body image problems, and social isolation may be seen. Stress and disappointment are common in women trying to conceive. Psychological support is an important part of treatment.
• Other effects of hormonal imbalances. High androgen levels in PCOS cause hirsutism, acne, and hair loss. Insulin resistance increases the risk of type 2 diabetes, hypertension, and metabolic syndrome. Untreated pituitary tumors can lead to vision loss and neurological problems.

Diagnosis of amenorrhea

To diagnose amenorrhea, your doctor evaluates your medical history, performs a physical examination, and orders various tests. The diagnostic process focuses on finding the cause of amenorrhea.

First, your doctor will ask about your menstrual history. Questions include when you had your first period, whether your menstrual cycles were regular, when you last had a period, and your pregnancy or breastfeeding status. Your symptoms, medication use, stress levels, exercise habits, and nutritional status are evaluated.

During the physical examination, your height, weight, and body mass index are measured. The thyroid gland is examined. Breasts are checked for milk discharge. Excessive hair growth, acne, or skin changes are evaluated. A pelvic examination is performed to evaluate the uterus and ovaries and look for anatomical abnormalities.

Tests

Tests to determine the cause of amenorrhea may include:

• Pregnancy test. In every woman of reproductive age, the first possible cause of amenorrhea is pregnancy. A urine or blood pregnancy test is performed. After pregnancy is ruled out, other causes are investigated.
• Hormonal blood tests. Blood levels of various hormones are measured. FSH (follicle-stimulating hormone) and LH (luteinizing hormone) evaluate ovarian function; high FSH may be a sign of early menopause. Prolactin level is measured; high prolactin may indicate a pituitary tumor. Thyroid hormones (TSH, T4) evaluate thyroid function. Estrogen and progesterone levels indicate ovarian function. Testosterone and DHEAS detect androgen excess (PCOS, adrenal problems).
• Progesterone withdrawal test. Your doctor may give you progesterone medication for a few days. If menstrual bleeding occurs 2-7 days after the medication is stopped, the ovaries are producing estrogen and the problem is lack of ovulation. If bleeding does not occur, estrogen levels may be very low or there may be a uterine problem.
• Pelvic ultrasound. Ultrasound images the ovaries, uterus, and other pelvic organs. In PCOS, numerous small cysts can be seen in the ovaries. Structural abnormalities (absence of uterus, uterine shape disorders) are detected. The thickness of the uterine lining is evaluated. Ovarian cysts or tumors can be seen.
• Brain MRI or CT scan. If prolactin level is high or there is suspicion of pituitary disorder, the pituitary gland is imaged. MRI or CT scan can detect pituitary tumors (prolactinoma). The size of the tumor and pressure on adjacent structures are evaluated.
• Hysteroscopy or hysterogram. If Asherman syndrome (intrauterine adhesions) is suspected, hysteroscopy may be performed to see inside the uterus. A thin camera is inserted through the vagina into the uterus. Hysterogram (HSG) images the uterine cavity and tubes with X-ray.
• Genetic tests. In primary amenorrhea or suspected early menopause, chromosome analysis (karyotype) may be performed. Turner syndrome (45,X) is one of the most common genetic causes. Fragile X premutation carrier status may be tested.
• Bone density test (DEXA). In prolonged amenorrhea, bone densitometry may be performed to evaluate bone loss. It is especially important in athletic amenorrhea or anorexia nervosa. If osteoporosis risk is high, treatment is planned.

Treatment of amenorrhea

Treatment of amenorrhea varies depending on the underlying cause. The goal of treatment is to restore normal menstrual cycles, prevent complications, and preserve fertility.

Lifestyle changes

In some types of amenorrhea, lifestyle changes alone can be effective. This approach is particularly important in hypothalamic amenorrhea.

• Weight management. In underweight women, gaining healthy weight can correct amenorrhea. The goal is to bring BMI to the 18.5-24.9 range. With support from a nutritionist, adequate calorie and nutrient intake should be ensured. In obese women, weight loss (bringing BMI below 30) can correct hormonal balance and restore ovulation, especially in PCOS. Even 5-10% weight loss can provide significant improvement.
• Exercise adjustment. Women who exercise excessively should reduce training intensity and duration. Aim for less than 5 hours per week of moderate-intensity exercise. Adding rest days and avoiding very intense cardio is important. When exercise is reduced and weight is gained, many athletes regain their periods.
• Stress management. Reducing chronic stress sources and developing coping mechanisms is important. Meditation, yoga, deep breathing exercises, and mindfulness techniques are beneficial. Psychotherapy or counseling can help cope with stressful life events. Adequate sleep (7-9 hours) supports hormonal balance.
• Balanced nutrition. Women with eating disorders should receive nutritional rehabilitation and psychological treatment. Adequate intake of calories, protein, healthy fats, and micronutrients (calcium, vitamin D, iron) is important. Very low-calorie diets and excessive restriction should be avoided.

Medication treatment

In hormonal imbalances, medication treatment is usually necessary. Treatment is personalized according to the cause.

• Hormonal birth control. Combined oral contraceptives (pills containing estrogen + progesterone) regulate periods in PCOS, lower androgen levels, and protect the uterine lining. Menstrual regularity is achieved but ovulation does not occur (not suitable for women planning to conceive). Birth control pills also improve hirsutism and acne. Estrogen protects bone health.
• Progestin therapy. In PCOS or chronic ovulatory disorders, periodic progestin (medroxyprogesterone) may be given to protect the uterine lining. Withdrawal bleeding occurs after 10-14 days of progestin use once a month. This reduces the risk of endometrial hyperplasia and cancer. Suitable for those not planning pregnancy.
• Ovulation stimulants. In women who want to conceive, clomiphene citrate or letrozole can stimulate ovulation. These medications encourage the ovaries to produce eggs. Commonly used in PCOS. Gonadotropin injections (FSH, LH) can be used in more resistant cases. Ovulation monitoring is done with ultrasound and hormonal tests.
• Metformin. If there is insulin resistance in PCOS, metformin can be used. Metformin regulates blood sugar, increases insulin sensitivity, and can improve ovulation. It is especially effective in obese or diabetic PCOS patients. Can be used alone or in combination with clomiphene.
• Bromocriptine or cabergoline. In high prolactin levels (hyperprolactinemia, prolactinoma), these medications lower prolactin levels. When prolactin returns to normal with treatment, ovulation and menstruation usually return. Medications can shrink the pituitary tumor. Milk discharge also resolves.
• Estrogen and progesterone replacement therapy. Women with premature ovarian insufficiency or premature menopause are given hormone replacement therapy (HRT). Estrogen prevents bone loss, reduces hot flashes, and protects heart health. Progesterone protects the uterus (in those with a uterus). HRT is generally recommended until natural menopause age (around age 50).
• Thyroid medications. If hypothyroidism is present, levothyroxine (synthetic thyroid hormone) is given. When thyroid hormones return to normal, menstrual regularity usually improves. In hyperthyroidism, antithyroid medications or radioiodine treatment is used.
• Glucocorticoids. In congenital adrenal hyperplasia, medications that replace cortisol (hydrocortisone, dexamethasone) lower androgen levels and restore ovulation.

Surgical treatment

Surgical correction may be needed for structural problems. Surgical treatment varies according to the cause.

• Hysteroscopic surgery. In Asherman syndrome (intrauterine adhesions), adhesions are cut with hysteroscopy. Estrogen therapy after the procedure helps prevent recurrence of adhesions. Periods can return after successful treatment and pregnancy may be possible.
• Imperforate hymen repair. When the hymen has no opening, a small surgical incision opens the hymen. Accumulated menstrual blood is drained and future periods can exit. It is a simple procedure and usually completely heals.
• Pituitary tumor surgery. Large prolactinoma or tumors that do not respond to medications may require surgical removal (transsphenoidal surgery). If the tumor is pressing on the optic nerves, emergency surgery is needed. Hormonal treatment may be needed after surgery.
• Ovarian surgery. In PCOS, laparoscopic ovarian drilling (LOD) may be performed in some women who do not respond to medications. Small holes are made in the ovaries; this can lower androgen levels and restore ovulation. However, this procedure is now rarely used because medication treatments are usually effective.

Assisted reproductive technologies

If natural ovulation cannot be achieved despite treatment or if there is early menopause, assisted reproductive technologies may be considered.

• In vitro fertilization (IVF). Ovaries are stimulated with medications, eggs are collected, fertilized with sperm in the laboratory, and embryos are transferred to the uterus. Can be used in PCOS, low ovarian reserve, and other ovulation problems.
• Donor eggs. Women without their own eggs due to early menopause or ovarian insufficiency can use donor eggs. Donor eggs are fertilized with sperm and embryos are transferred to the woman's uterus. Pregnancy and childbirth are possible.
• Egg freezing. Young women before chemotherapy or radiation treatment can freeze eggs to preserve future fertility. Eggs are collected before treatment, frozen, and used later.

Prevention of amenorrhea

Some causes of amenorrhea cannot be prevented (such as genetic conditions), but lifestyle changes can help reduce risk.

• Stay in a healthy weight range. Try to keep your BMI in the 18.5-24.9 range. Very low or very high weight can disrupt hormonal balance. Healthy, balanced nutrition and regular moderate exercise help with weight management.
• Avoid excessive exercise. Exercise is healthy but too much is harmful. More than 5 hours of intense exercise per week can increase amenorrhea risk. Add rest days and listen to your body. If your periods become irregular or stop, reduce the amount of exercise.
• Manage stress. Chronic stress disrupts hormonal balance. Practice regular relaxation techniques (meditation, yoga, breathing exercises). Get adequate sleep and seek social support. If necessary, seek help from a therapist or counselor.
• Eat a balanced diet. Get adequate calories, protein, healthy fats, vitamins, and minerals. Avoid overly restrictive diets. If you notice signs of eating disorders, seek professional help.
• Regular gynecological check-ups. See a gynecologist at least once a year. When menstrual irregularities are detected early, treatment is easier. If menstruation has not started by age 15 or if you haven't had a period for 3 months, see a doctor.
• Pay attention to medication side effects. If you are taking prescription medications and your periods stop, inform your doctor. Some medications can have side effects and alternative options may be available.
• Keep health conditions under control. If you have conditions such as diabetes, thyroid disease, or PCOS, regular follow-up and treatment are important. Controlled diseases reduce amenorrhea risk.
• Avoid smoking and excessive alcohol use. Smoking increases early menopause risk. Excessive alcohol can disrupt hormonal balance. Healthy lifestyle choices protect reproductive health.

Preparing for your appointment

Seeing a doctor with suspicion or diagnosis of amenorrhea can cause anxiety. However, going prepared helps facilitate the diagnostic process and helps you better understand treatment options.

What you can do:

• Note your menstrual history (age at first period, last period date, cycle regularity).
• Write down your symptoms (hot flashes, milk discharge, excessive hair growth, weight changes).
• Bring previous gynecological tests if available (hormone tests, ultrasound reports).
• List all medications you use (prescription, over-the-counter, birth control, herbal products).
• Prepare past pregnancy, childbirth, or miscarriage history.
• Mention if there is early menopause or amenorrhea in the family.
• Evaluate your exercise and nutrition habits.
• Consider your stress level and psychological state.
• State whether you are planning to conceive.
• Write your questions in advance.
• If possible, bring a companion.

Questions you can ask your doctor:

• What is the cause of my amenorrhea?
• Can I get pregnant?
• What treatment options are available?
• Do I need to take medication? For how long?
• Can lifestyle changes be sufficient?
• Is my bone health at risk?
• When can I get my periods back?
• What will the follow-up frequency be?
• What are the long-term health risks?
• What can I do to preserve my fertility?

Your doctor may ask you:

• When did you have your first period?
• When was your last period?
• Is there a chance you could be pregnant?
• Have you had regular periods before?
• What are your symptoms? (Hot flashes, milk discharge, hair growth?)
• Has your weight changed recently?
• How much do you exercise?
• What is your stress level?
• Is there amenorrhea or early menopause in the family?
• Are you using medications or birth control?