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10 Most Common Causes of Missed and Irregular Periods

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Missed a period? The first thing to consider is pregnancy. If that is ruled out, other possible causes might be related to the use of certain birth control pills or entering menopause.

One of the side effects of a low-dose birth control pill is a light or nonexistent period. So, it may be time to consult your doctor about changing your birth control pills. Also, going through menopause can cause irregular periods before they end entirely.

Aside from those three possibilities, there are several health problems as well as lifestyle and environmental factors that can impact your periods.


If your periods have been regular but suddenly became irregular, take the issue seriously.

The abnormal absence of a period is called amenorrhea. Irregular periods can be defined as:

  • Metrorrhagia– when irregular bleeding occurs between your expected periods.
  • Oligomenorrhea– when menses occur at intervals of greater than 35 days.
  • Polymenorrhea– when menses occur at intervals of 21 days or less.

causes of missed or irregular periods

Here are the 10 most common causes of missed and irregular periods.


1. High Stress Level

Your stress level can affect your menstrual cycle. If you’re experiencing extremely high stress, it can cause missed or irregular periods.

When your body is busy handling extreme stress, your brain shuts down the production of estrogen and other reproductive hormones needed for ovulation. This is done to prevent reproduction in a threatening environment as well as to conserve energy. As a consequence, you don’t get your period on time.

high stress causes irregular menses

A 2015 study published in the Journal of Clinical & Diagnostic Research reports that high stress levels were associated with only menstrual irregularities and not with duration, amount of flow or dysmenorrhea. This cross-sectional study was conducted on 100 female undergraduate students of a medical college.

Make sure to relax after work and make time to de-stress your mind and body. Try yoga, a hot bath or reading a book.

2. Over-Exercising

Although regular exercise is good for your overall health, excess exercise can be bad for females, especially those who are athletes. In fact, excess exercise is one of the key reasons behind disruption of the menstruation cycle.

over exercising causes irregular menstruation

Like other stress hormones, cortisol is released in response to any physical exertion, which in turn can deplete the body of energy needed to regulate sex hormones.

A 2008 study published in the Annals of the New York Academy of Sciences reports that exercise-induced amenorrhea can be an indicator of an energy drain, and the presence of the other components of the female athlete triad-bone density loss and eating disorders must be determined as well. The study emphasized that addressing skeletal problems related to nutritional and hormonal deficiencies in this population is very important.

Along with excess physical stress, several other factors contribute to the loss of periods in athletes. Such factors include low body fat and high energy expenditure.

Consult your doctor to determine whether your missed or irregular periods are a result of excessive exercise. You may need to work with an expert to help you plan a healthy exercise routine.

3. Low Body Fat

When your body mass index (BMI) falls below 18 or 19, you have little body fat. Low body fat can interrupt many hormonal functions in your body, potentially halting ovulation and affecting your menstrual cycle.


low body fat causes irregular menses

Body fat is important for creating the hormone estrogen, which when low can contribute to irregular periods and bone loss. In fact, those who have low body fat are at a higher risk of suffering from serious conditions such as anorexia and bulimia. People suffering from anorexia and bulimia often experience absent or missed periods.

Always remember that you need a certain amount of body fat to ovulate, so an extreme low-calorie and low-fat diet is a big no for females.

Experts believe that it is important to maintain a body fat percentage of 17 to 22 percent to maintain normal menstrual function. In fact, before beginning a weight-loss diet or starting a new training regimen, always consult your doctor.

4. Polycystic Ovarian Syndrome (PCOS)

Polycystic ovarian syndrome (PCOS) is a hormone imbalance in women that affects ovulation, which can cause irregular periods. Other signs of PCOS include acne, excessive hair growth and weight gain.

PCOS causes irregular periods

When suffering from PCOS, there can be high and sustained levels of sex hormones — including estrogen, progesterone and testosterone – as compared to the fluctuating levels seen in the normal menstrual cycle.

A 2014 study published in Human Reproduction reports that elevated androgen levels in adolescence are associated with PCOS and infertility in later life. In fact, this study emphasizes the importance of early identification of menstrual irregularity.

In addition to causing irregular periods and infertility, PCOS can increase the risk of diabetes and heart disease.

5. Thyroid Disorder

Any kind of thyroid gland malfunction, whether it is an overactive thyroid (hyperthyroidism) or underactive thyroid (hypothyroidism), can cause menstrual irregularities.

The thyroid gland produces hormones that maintain the body’s metabolism and impacts many sex hormones. Changes in estrogen and cortisol hormones can halt ovulation, which in turn affects the menstrual cycle.

thyroid disorders cause period problems

A 1999 study done in Mexico and published in Ginecología y obstetricia de México indicates that primary hyperthyroidism is one of the leading causes behind missed periods.

A recent 2016 study published in the Journal of Obstetrics and Gynecology of India reports that thyroid dysfunction is an important causative etiology of menstrual abnormalities. The study put emphasis on the assessment of thyroid function in women with menstrual disorders to avoid unnecessary interventions like curettage and hysterectomy.

6. Excessive Drinking

According to the National Institute on Alcohol Abuse and Alcoholism, drinking alcohol can cause irregular periods as well as infertility.

excessive drinking causes missed or irregular periods

Excessive and even moderate drinking can affect the menstruation cycle. The toxins in alcohol can cause permanent tissue damage and disrupt the delicate hormonal balance critical for maintaining menstrual cycles.

In fact, alcohol intake is linked to an increased level of the sex hormones estrogen and testosterone. Changes in these hormones affect ovulation, thus affecting when you menstruate and leading to irregular periods.

Not just irregular periods, alcohol toxins can make it difficult for a woman to conceive and even reduce the chances of having a healthy baby.

10 Most Common Causes of Missed and Irregular Periods was last modified: December 30th, 2016 by Top10HomeRemedies
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