A period is generally considered late if it is 5 to 7 days past the expected start date. Periods can normally vary, with menstrual cycles ranging from 21 to 35 days for adults. A delay longer than a week, especially if persistent, may warrant attention or a pregnancy test. If a period is delayed by 6 weeks or more, it is often considered a missed period. Various factors can cause a late period, including stress, weight changes, exercise, hormonal imbalances, medications, and underlying health conditions.
When Is a Period Late?
Periods are late if they do not start within about 5 to 7 days after the expected date based on an individual's usual cycle length. Some variability is normal, but consistent delays are less so.
How Long Can It Be Late?
Cycles can range between 21 and 35 days (up to 40 days in some cases). A period can be considered late if it goes beyond 35 days without starting. A delay of 6 weeks or more is typically viewed as a missed period requiring medical evaluation.
Common Causes of Late Periods
Late periods can be caused by stress, changes in weight, excessive exercise, hormonal conditions such as polycystic ovary syndrome (PCOS) or thyroid issues, medication effects, and life stage changes like perimenopause or breastfeeding.
In summary, if a period is more than 5-7 days late, it is considered late. If the delay is longer than six weeks, it is usually classified as a missed period that may require medical advice, especially if pregnancy is ruled out. Irregularities can be normal but persistent delays should be evaluated.
