Irregular Periods: Causes, Pregnancy & More

Menstrual cycles are a fundamental aspect of women’s reproductive health. However, many women experience irregular periods at some point in their lives. These irregularities can be disconcerting and concerning, but it’s important to understand that in most cases, they are normal and can be due to a variety of factors. In this article, we will explore the causes behind irregular periods, their relationship to pregnancy, and provide useful information to manage this situation.

What Are Irregular Periods?

A regular menstrual cycle usually lasts between 21 and 35 days, counting from the first day of one period to the first day of the next. A cycle is considered irregular if it varies significantly in length from month to month or if alterations in the amount of menstrual flow occur.

Causes of Irregular Periods

Hormonal changes

Hormonal fluctuations are one of the main causes of irregular periods. Levels of hormones such as estrogen and progesterone can vary due to factors such as stress, puberty, perimenopause (the period leading up to menopause), and hormonal disorders.

Polycystic Ovary Syndrome (PCOS)

PCOS is a common hormonal condition that can lead to irregular periods. In PCOS, the ovaries can develop cysts that affect the regular release of eggs, which can result in irregular menstrual cycles and fertility problems.

Weight Changes

Sudden changes in weight, either loss or gain, can influence periods. Body fat is related to the production of reproductive hormones, so alterations in body weight can trigger irregularities in the cycle.


Chronic stress can affect the functioning of the hypothalamus-pituitary-ovarian axis, which regulates the menstrual cycle. Extreme stress can lead to the absence of irregular periods or cycles.

Underlying Diseases

Certain medical conditions, such as diabetes and overactive or underactive thyroid, can influence the regularity of the menstrual cycle.

Use of contraceptives

Starting, changing, or stopping hormonal contraceptives can cause temporary irregularities in periods as the body adjusts to new hormone levels.

Irregular Periods and Pregnancy

A common question that arises among women with irregular periods is whether it is possible to get pregnant in those circumstances. The answer is yes, but with some additional considerations.

Ovulation, the release of a mature egg by the ovary, is a key factor in getting pregnant. In regular menstrual cycles, ovulation usually occurs around the middle of the cycle. However, in irregular cycles, ovulation can be harder to predict. This means that women with irregular periods may have unpredictable fertility windows.

If a woman is trying to conceive with irregular periods, keeping careful track of her cycles, using ovulation predictor kits, and working together with a health professional can increase the chances of success.

When Should You See a Healthcare Professional?

While many irregularities are normal and can be attributed to temporary factors, there are situations in which it is advisable to seek medical guidance:

  • Missed Periods: If you have had regular cycles in the past and suddenly experience missed periods for several months, it is important to consult a physician to rule out underlying health problems.
  • Severe Pain: Menstrual cramps are normal, but extreme pain that interferes with your daily activities could indicate a condition such as endometriosis.
  • Excessive bleeding: If you experience extremely heavy bleeding (menorrhagia) or prolonged bleeding, it may be necessary to seek medical attention.

Tips for Managing Irregular Periods

  • Keep a Record: Keep track of your menstrual cycles and any associated symptoms. This can help you identify patterns and spot potential problems.
  • Healthy Lifestyle: Maintaining a balanced diet, exercising regularly and managing stress can help regulate menstrual cycles.
  • Consult a Professional: If your irregular periods worry you or interfere with your quality of life, do not hesitate to consult a doctor. A health professional can provide guidance and testing if needed.
  • Hormonal Contraceptives: In some cases, hormonal contraceptives prescribed by a doctor can help regulate menstrual cycles.


Irregular periods are a common experience for many women and are usually caused by hormonal changes, stress, weight changes, or other underlying medical conditions. Although irregularities can make it difficult to predict ovulation, it is possible to get pregnant with irregular cycles. If the irregularities are persistent, extremely painful or worrisome, it is advisable to seek medical advice. Leading a healthy lifestyle and keeping track of your cycles can also be helpful in managing this situation successfully. Remember that every body is unique and what may be normal for one person may vary for another.

Press ESC to close