When to worry about late periods?
Short answer: If you have a regular cycle, worry if your period is more than about one week late after ruling out pregnancy; if you miss three consecutive cycles (secondary amenorrhea) get medical evaluation. Seek immediate care for very heavy bleeding, severe pain, fever, fainting, or signs of infection.
Explanation
“Late” depends on your typical cycle length and variability. Common causes include pregnancy, stress, significant weight change, intense exercise, polycystic ovary syndrome (PCOS), thyroid disorders, high prolactin, recent hormonal contraception changes, illness, or perimenopause. For people with regular monthly cycles, a single small delay is often benign, but repeated delays, an absence of menses for three months, or new concerning symptoms warrant testing (pregnancy test, thyroid function, prolactin, and sometimes pelvic ultrasound or hormonal panels) and clinical assessment. Age, chronic conditions, and medications can change what is normal for you, so individual context matters.
Tips
- Take a pregnancy test if sexually active and your period is late.
- Track cycles for several months to identify patterns and variability.
- See your healthcare provider if you miss three periods in a row or if your period is >1 week late repeatedly despite a negative pregnancy test.
- Review recent medication or contraceptive changes with your clinician.
- Seek urgent care for very heavy bleeding (soaking a pad/tampon hourly), severe abdominal pain, fever, dizziness, or fainting.
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