How long after a missed period should you start worrying?
Short answer: If you miss one period, first consider a home pregnancy test and recent changes in stress, weight, exercise, or medication—most single missed periods are not a medical emergency. Seek medical advice if your period is more than one week late with a negative pregnancy test and persistent symptoms, or if you miss two or more consecutive periods (secondary amenorrhea).
Explanation
Missed periods are commonly caused by pregnancy, hormonal fluctuations (thyroid, prolactin), polycystic ovary syndrome (PCOS), significant weight change, stress, intense exercise, or changes in contraception. Home pregnancy tests are generally accurate when taken at or after the first day of a missed period; sensitivity varies, but waiting one week after a missed period increases reliability. If pregnancy is excluded and cycles remain absent for two or more months, or you experience severe pelvic pain, heavy bleeding, fainting, fever, or shoulder pain, seek immediate medical care because these can indicate ectopic pregnancy, infection, or other urgent conditions. For ongoing absence of periods (three consecutive months or more in some guidelines, or two missed cycles), a clinician will evaluate with history, pregnancy testing, hormone blood tests, and possibly ultrasound to determine cause and treatment.
Tips
- Take a home pregnancy test on the day of your missed period or one week after for greater accuracy.
- Track cycles, stress, weight, exercise, and medication changes to share with your clinician.
- See a healthcare provider if you miss two consecutive periods or if one missed period is accompanied by concerning symptoms.
- If you use hormonal contraception and miss expected bleeding, follow the product instructions and consult your prescriber if unsure.
- For recurrent irregularity, ask about tests for thyroid function, prolactin, and PCOS evaluation.
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