About this symptom
Menstrual periods may arrive earlier or later than usual or be missed for several cycles. An occasional fluctuation differs from a persistent change in the pattern. A missed period is not a diagnosis and should not be attributed automatically to stress or polycystic ovary syndrome (PCOS).
Possible causes and features
Pregnancy is an important initial consideration if conception is possible. Other influences include hormonal contraception, breastfeeding, major weight changes, intense exercise, prolonged stress and perimenopause. Ovulation disorders, thyroid disease and other endocrine conditions may also contribute.
Home pregnancy tests are usually most reliable from the first day a period is missed. If you do not know when the next period should start, testing at least 21 days after unprotected intercourse is a common guide. An uncertain result, pain or bleeding calls for a clinical discussion.
Assessment and next steps
PCOS can cause infrequent periods, but a cycle calendar, one ultrasound or a single hormone test does not establish the diagnosis. The clinician assesses several criteria and excludes alternatives. Diagnostic criteria differ in adolescents.
Keep a record of cycle dates, bleeding volume, medicines, contraception and symptoms such as acne, unwanted hair growth, weight changes, nipple discharge or hot flushes. Testing and treatment depend on the likely cause and pregnancy plans. Avoid starting hormones to regulate the cycle without an assessment.
Related topics: Gynecologic examination; Heavy periods; Bleeding between periods.
Signs and symptoms
- Periods arriving at very different intervals or missing for several cycles.
- Delayed bleeding, sometimes followed by unexpected spotting.
- Sometimes acne, hair growth, weight changes or other accompanying symptoms.
Diagnosis and tests
History focuses on cycle timing, pregnancy possibility, medicines and associated symptoms. A pregnancy test, examination, laboratory tests or pelvic ultrasound may be considered; not every patient needs the same set of investigations.
Care and treatment approaches
Care depends on the cause and whether pregnancy is planned. Options include observation, reviewing contraception, addressing ovulation or endocrine conditions and discussing cycle management. Treatment should be selected after assessment.
When to seek urgent care
Seek emergency care if a missed period comes with severe or one-sided lower abdominal pain, fainting, dizziness or substantial bleeding, particularly when pregnancy is possible. If periods are absent for three cycles or changes continue, arrange routine evaluation. In Ukraine call 103 or 112 for emergency symptoms.
Frequently asked questions
Does a delayed period mean PCOS?
No. Pregnancy, stress, contraception, weight changes, perimenopause, thyroid disorders and other conditions can cause delays. PCOS requires several diagnostic criteria.
When should I take a pregnancy test?
Usually from the first day of a missed period. If the expected date is unknown, generally at least 21 days after unprotected sex.
What if I have missed three periods?
Arrange a gynecology appointment to discuss possible causes and an individual assessment plan.
Information sources
Medical source links used when preparing this article.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
