A period is generally considered late if it does not start within 5 to 7 days after the expected date based on your usual cycle. Menstrual cycles typically range from 21 to 35 days, so if your period is more than about a week late, it is regarded as late and could be due to various factors. Occasional delays are common and can be caused by stress, hormonal imbalances, lifestyle changes, medications, or health conditions. If a period is over 35 days late, that is considered significantly late and could require medical evaluation.
When is a period late?
- A period is late if it doesn't start 5 or more days after the expected date based on your usual cycle length (generally 21 to 35 days).
- If your period is more than 7 days late, it is considered late enough to warrant attention or testing, such as for pregnancy.
Causes for late periods
- Stress, weight changes, excessive exercise, travel, or changes in routine
- Hormonal imbalances such as PCOS, thyroid conditions, or perimenopause
- Medications including contraceptives or other treatments
- Pregnancy is a primary cause of a missed or much-late period.
When to be concerned
- Missing more than 3 periods in a row without pregnancy or other clear cause should prompt medical consultation.
- Periods consistently longer than 35 days or completely absent (secondary amenorrhea) may signal underlying issues needing treatment.
In summary, a period can be late by about a week or more relative to the expected cycle length before it becomes potentially concerning. Factors like pregnancy or health issues often explain significant delays. Tracking cycles and consulting a healthcare provider if periods are frequently late or absent is recommended.
