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Delayed Period: Causes and When to See a Doctor

A menstrual cycle of 21–35 days is normal. A period arriving 1.5 weeks "late" may still be within your normal variation. Factors influencing cycle length:

  • Hormonal fluctuations (estrogen, progesterone)
  • Lifestyle: stress, diet, exercise, sleep
  • Medical conditions: thyroid disorders, PCOS
  • Medications: birth control, others

Consult a provider if you have a significant change in regularity or concerns.

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