When should I worry about a missed period?
Short answer: A single missed period is common and often not serious, but you should seek evaluation if you test positive for pregnancy, have severe pain or heavy bleeding, or if your periods stop for three months or more. Also consult sooner if you have risk factors like very irregular cycles, known endocrine disorders, or symptoms of menopause before age 40.
Explanation
Missing a period (oligomenorrhea or amenorrhea) can result from pregnancy, stress, significant weight gain or loss, intense exercise, breastfeeding, recent hormonal contraception changes, or common medical causes such as polycystic ovary syndrome (PCOS), thyroid dysfunction, elevated prolactin, or premature ovarian insufficiency. First-line action is a urine pregnancy test if sexually active. If pregnancy is excluded and cycles remain absent or irregular for multiple months, or if there are additional symptoms (heavy bleeding, severe pelvic pain, hot flashes, hair loss, galactorrhea), medical evaluation with history, physical exam, basic labs (pregnancy test, TSH, prolactin), and possibly pelvic ultrasound is appropriate. Immediate care is warranted for severe abdominal pain, fever, fainting, very heavy bleeding, or positive pregnancy test with pain or bleeding, as these could indicate complications like ectopic pregnancy.
Tips
- Do a pregnancy test first if sexually active.
- Track cycles and symptoms for 2–3 months before assuming a chronic problem.
- See a clinician if periods stop for ≥3 months (not due to contraception or breastfeeding).
- Seek urgent care for severe pain, fainting, fever, or very heavy bleeding.
- Mention medications, recent weight/exercise changes, and contraception history to your provider.
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