How much delay in period is normal?
Short answer: A delay of a few days to about one week is common and usually not a sign of a problem. Cycles between 21 and 35 days are considered normal; if your period is more than one week late repeatedly or absent for three months (amenorrhea), seek medical advice.
Explanation
Menstrual cycles naturally vary because of hormonal fluctuations. Common causes of a short delay include pregnancy, stress, recent weight change, intense exercise, illness, travel, and changes in contraception. Conditions such as polycystic ovary syndrome (PCOS), thyroid disorders, and perimenopause can cause more persistent irregularity. If pregnancy is excluded and delays are recurrent or accompanied by heavy bleeding, severe pain, or other concerning symptoms, clinicians may evaluate with a pregnancy test, pelvic exam, blood tests (FSH, LH, TSH, prolactin, progesterone), and sometimes ultrasound to identify underlying causes.
Tips
- Take a home pregnancy test if sexually active and your period is late.
- Track cycle length and symptoms for several months to identify patterns.
- Review recent stressors, weight loss/gain, exercise changes, and medications.
- Discuss persistent irregularity or missed periods with a primary care doctor or gynecologist.
- Manage modifiable factors: balanced diet, regular sleep, and moderate exercise.
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