Amenorrhea: Meaning, Types, Causes, Diagnosis, and Treatment

Sometimes this is expected, such as during pregnancy, breastfeeding, menopause, or intentional menstrual suppression with certain hormonal methods. In other situations, missing periods may indicate that hormones, the ovaries, the uterus, the brain’s reproductive signaling system, nutrition, stress, or another health factor has changed.

Amenorrhea does not automatically mean infertility. Ovulation may occur unpredictably, and pregnancy can sometimes happen even when periods are absent or irregular.

• Amenorrhea may have several possible causes.
• The patient sought care for amenorrhea.
• Hormonal treatment caused temporary amenorrhea.
• The clinician investigated the absence of menstruation.

The adjective amenorrheic describes a person or condition involving absent periods:

• an amenorrheic patient;
• an amenorrheic interval;
• an amenorrheic menstrual pattern.

In British English, the term is commonly spelled amenorrhoea.

Clinical evaluation is generally recommended when a person has not had a first menstrual period by age 15 or within about three years after breast development began. Earlier assessment may be appropriate when other signs of puberty are absent or when pain suggests that menstrual flow may be blocked.

Possible causes include:

• differences in chromosomes or reproductive development;
• ovaries that do not function normally;
• hormonal signaling problems involving the hypothalamus or pituitary gland;
• low energy availability or eating disorders;
• extreme exercise or severe stress;
• an absent or differently developed uterus, cervix, or vagina;
• a blockage preventing menstrual flow.

Primary amenorrhea does not reveal a person’s gender identity, sexual orientation, or sexual experience.

It is commonly evaluated after three months without menstruation in someone whose cycles were previously regular, or after about six months when cycles were already irregular. Pregnancy is the most common natural cause and is generally considered first during assessment.

Secondary amenorrhea may be temporary or long-lasting, depending on its cause.

It commonly occurs during:

• Pregnancy: menstruation usually stops after pregnancy begins;
• Breastfeeding: hormones involved in milk production may suppress ovulation and menstruation;
• Menopause: menstrual periods permanently stop as ovarian reproductive activity declines;
• Hormonal menstrual suppression: some contraceptive or gender-affirming hormone regimens reduce or stop bleeding.

The absence of withdrawal bleeding while appropriately using certain hormonal contraceptives does not mean menstrual blood is trapped inside the uterus. These methods often keep the uterine lining thin.

Possible causes include:

• polycystic ovary syndrome;
• functional hypothalamic amenorrhea;
• thyroid disorders;
• elevated prolactin;
• pituitary conditions;
• primary ovarian insufficiency;
• substantial weight loss or gain;
• low calorie or nutrient intake;
• intensive exercise;
• chronic illness;
• certain medications;
• uterine scarring;
• anatomical differences affecting menstrual flow.

The cause cannot be identified from the missed periods alone.

It may be associated with:

• insufficient energy intake;
• low body weight or body fat;
• eating disorders;
• intensive physical training;
• psychological stress;
• a combination of exercise, nutrition, and emotional factors.

It is considered a diagnosis of exclusion, meaning pregnancy and other anatomical, hormonal, or medical causes must first be ruled out. Prolonged low-estrogen states associated with this condition may reduce bone density and increase fracture risk.

These may include:

• pelvic pain;
• acne;
• increased facial or body hair;
• major weight change;
• headaches or vision changes;
• nipple discharge unrelated to breastfeeding;
• hot flashes;
• vaginal dryness;
• changes in sexual desire;
• delayed pubertal development.

Symptoms vary, and their presence does not confirm a specific diagnosis.

Depending on the situation, assessment may include:

• questions about cycle patterns, medication, exercise, eating, stress, and pregnancy possibility;
• a physical or pelvic examination when appropriate;
• blood tests for thyroid, prolactin, estrogen, follicle-stimulating hormone, and other hormone levels;
• pelvic ultrasound;
• genetic testing or brain imaging in selected cases.

Not every person needs every examination or test. The evaluation should reflect age, symptoms, anatomy, health history, and the likely causes.

Possible approaches may include:

• treating an underlying thyroid, pituitary, ovarian, or reproductive condition;
• improving energy and nutrient intake;
• modifying excessive exercise;
• addressing stress or an eating disorder;
• changing a medication when medically appropriate;
• using hormonal treatment;
• removing uterine scar tissue or correcting an anatomical blockage in selected cases;
• providing fertility treatment when pregnancy is desired.

The goal is not always simply to produce bleeding. Care should address the underlying cause and the person’s health priorities.

Ovulation may return before the first new period, and it may occur unpredictably. Someone who does not want pregnancy may therefore still need contraception unless a clinician has confirmed that pregnancy cannot occur.

• menstruation has not begun by age 15;
• previously regular periods stop for three months;
• previously irregular periods stop for about six months;
• pregnancy may be possible;
• amenorrhea occurs with pelvic pain, headaches, vision changes, nipple discharge, or major weight change;
• there are signs of an eating disorder or serious nutritional deficiency;
• the absence of periods is unexpected or concerning.

Urgent care may be needed when missed periods occur with severe pelvic or abdominal pain, faintness, heavy bleeding, or a positive pregnancy test because these symptoms can sometimes indicate an ectopic pregnancy or another urgent condition.

Some people intentionally seek amenorrhea through menstrual-suppression methods or gender-affirming hormone therapy because menstruation causes dysphoria, discomfort, or practical difficulty.

Appropriate language may include:

• women and girls;
• people who menstruate;
• patients with amenorrhea;
• people with a uterus or ovaries.

The wording should fit the medical context and respect the individual’s identity.

Missing one period always means amenorrhea.
One late or missed period can occur for many reasons; clinical definitions usually involve age or a longer absence.

Amenorrhea means pregnancy is impossible.
Ovulation may still occur unpredictably.

Periods must happen for blood to leave the body.
Hormonal suppression can keep the uterine lining thin, leaving little or nothing to shed.

Amenorrhea always results from low body weight.
It has many possible hormonal, anatomical, medical, and medication-related causes.

Every person with amenorrhea wants menstruation restored.
Some people intentionally suppress menstruation and may consider the absence of bleeding beneficial.

• primary amenorrhea;
• secondary amenorrhea;
• functional hypothalamic amenorrhea;
• prolonged amenorrhea;
• medication-induced amenorrhea;
• lactational amenorrhea;
• evaluate amenorrhea;
• treatment of amenorrhea.

1. Amenorrhea means the absence of menstrual periods.
2. Pregnancy is a common cause of secondary amenorrhea.
3. Primary amenorrhea may require evaluation by age 15.
4. Intensive exercise and low energy intake contributed to hypothalamic amenorrhea.
5. The clinician ordered hormone tests and a pelvic ultrasound.
6. Hormonal contraception intentionally stopped her menstrual bleeding.
7. Amenorrhea did not guarantee that pregnancy was impossible.
8. Prolonged low estrogen affected bone health.
9. Not every person experiencing amenorrhea identifies as a woman.
10. Treatment depended on the underlying cause and the patient’s goals.

It may affect vaginal moisture, sexual desire, fertility plans, or feelings about the body, depending on the underlying hormonal or medical cause. For some transgender and nonbinary people, intentional menstrual suppression may reduce gender dysphoria and improve comfort.

Healthy sexuality includes understanding that absent menstruation does not determine gender, desirability, sexual orientation, or reproductive intentions. Appropriate care should respect bodily autonomy, identity, contraception needs, fertility goals, and the person’s decision about whether menstrual bleeding is wanted.