A period is generally considered late if it does not begin five or more days after the expected start date based on the usual menstrual cycle length. Most menstrual cycles range between 21 to 35 days, with around 28 days being average. If a period does not start within this usual time frame, especially if it is more than a week late, it is considered late and may warrant further attention.
Definitions of Late Period
- A delay of 5 or more days beyond the expected start is typically considered late.
- Some sources note that if menstruation has not occurred by 35 days, it is considered late.
- A period can be considered late if it does not start within 7 days of the expected date.
What Factors Affect Timing?
- Stress, weight changes, excessive exercise, illness, and lifestyle changes can cause occasional late periods.
- Hormonal imbalances (e.g., PCOS, thyroid disorders) and medication such as contraceptives may also cause delays.
When to Be Concerned
- If the period is consistently late or missed for several cycles, medical advice is recommended.
- If pregnancy is suspected, a pregnancy test is advised once the period is late by a week or more.
- If the cycle length varies by more than 7 to 9 days regularly, it is considered irregular.
In summary, a period is considered late when it is more than 5-7 days past the expected start date based on one's usual menstrual cycle length. Tracking cycles over time helps determine what is normal for an individual and when to seek medical guidance.
