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Irregular periods and hormonal imbalance

Reviewed by , ND

Irregular periods are extremely common as the first sign of hormonal imbalance. Your body may just need extra support to return your menstrual cycle to its regular, healthy pattern. If your irregular periods continue after taking our recommended steps, see your practitioner to find out what’s going on.

A woman with a painful irregular period

Most of us have experienced irregular periods. These are usually due to temporary conditions such as times of extreme stress or when we start new exercise routines. But it’s a different story if the irregularity continues with respect to length, frequency, spotting, or if the “new” amount of bleeding during your period becomes a regular occurrence. At that point, you might start to feel worried or concerned, especially when you don’t know the cause of your irregular periods.

What is an irregular period?

Menstruation occurs every 21-35 days (average 28 days), with periods lasting from four to seven days, depending on the woman. There’s a fair amount of variation because everyone is different. The entire menstrual process is orchestrated by hormonal signals from your body and feedback loops between your brain and ovaries. Most important is what’s normal for you.

Irregular periods can be longer, shorter, heavier, or lighter than normal, and can include spotting or skipping days (or months). While there is no one set definition of an irregular period, you’re the best judge because you’re the one who will notice if there have been changes to your regular menstrual cycle pattern — which is really what “irregular” means.

Irregular periods — common hormonal causes

When your periods change suddenly, the most common cause is an imbalance in your hormones, especially estrogen and progesterone. Observing the pattern of irregularity and then asking yourself certain questions can help pin down why your periods are off-kilter.

Common causes due to hormone imbalances

Bleeding pattern Possible causes Questions to ask
Periods have become sporadic (oligomenorrhea) or disappeared for at least three months (amenorrhea).

Note: Ongoing irregular periods (including their absence) can be associated with bone loss.

1) Perimenopause
Perimenopause may account for about half of all irregular periods. In perimenopause, monthly ovulation becomes less reliable, eventually stopping completely, though the transition can sometimes last for years. Because ovaries are now responding less efficiently to pituitary hormones, periods and ovulation can become intermittent.
Are you between 45 and 55?

Has the number of days between periods increased?

Have you been experiencing hot flashes, night sweats or other symptoms?

2) Psychological stress
Acute or chronic stress makes your body produce extra cortisol, a stress hormone. Because your body interprets stress as an emergency, it prioritizes ‘survival’ over reproductive function. Then estrogen and progesterone can become imbalanced, altering your periods until the stress eases.
Have you been under more stress than usual? Do you have other stress symptoms?
3) Physical stress
Body stressors can have effects on the menstrual cycle similar to those of emotional stress. Stress hormones hijack resources that would otherwise go toward producing sex hormones and normal cycles. Are you on a new fitness regimen?
Did you recently start a strict diet?

Did you recently lose a significant amount of weight?

Have you suffered a recent illness?

Did you quit smoking or change another long-time habit?

4) Polycystic ovary syndrome
PCOS affects 5-10% of premenopausal women. Continued lack of ovulation disrupts periods. They may be irregular, absent, or unusually heavy. In many cases, insulin resistance and signs of increased male hormones are present.
Have you been experiencing acne or unusual hair growth?

Do you have excess abdominal fat? (increases the risk)

5) Prolactinoma
High prolactin can cause periods to become irregular or stop altogether. Although high prolactin levels can be connected to low thyroid function, severe stress, pregnancy, and certain drugs, the most common cause is a benign pituitary tumor that produces the hormone.
Have you noticed any nipple discharge?

Have you been trying to get pregnant without success?

Do you have acne or unusual hair growth?

Periods have been much heavier than normal (menorrhagia).

Very heavy periods occur in 15-20% of otherwise-healthy women.

Note: If your periods have been heavy for a while, ask your practitioner to test you for possible anemia.

1) Perimenopause
During perimenopause, progesterone levels can fall too low relative to estrogen. Then the uterine lining can thicken too much, so the period may be unusually heavy. (If your heavy periods are still regular, you’re probably still ovulating.)
Are you between 45 and 55?
2) Weight gain
Fat tissue makes estrogen: the more you have, the greater the estrogen production. This can further thicken the uterine lining, resulting in heavier periods.
Has your weight increased by more than 10-15 pounds within the past few months?
3) Hypothyroidism
Low thyroid function can cause heavier periods in many women. Hypothyroidism is involved in 20-45% of heavy periods.
Have you been experiencing symptoms of hypothyroidism, such as sluggishness, puffiness, constipation, cold extremities, unexplained weight gain, fuzzy thinking, hair loss or depression?
You’re spotting between periods (metrorrhagia).

Note: Sudden postmenopausal bleeding not caused by any of these should be checked by your healthcare practitioner.

1) Menopause
Vaginal tissues are thinner and more vulnerable to irritation when estrogen levels drop in menopause. Mild physical irritation causes tissues to bleed more easily.

Any sudden postmenopausal bleeding that isn’t due to this cause should be checked immediately.

Is the spotting occurring after sexual intercourse?

Is intercourse physically uncomfortable?

Do you have vaginal dryness?

2) Abnormal pregnancy
Fallopian-tube pregnancy or miscarriage can cause breakthrough bleeding in premenopausal women.

Could you be pregnant?

Do you have any history of miscarriage?

3) Low-dose oral contraceptives, IUD, or postmenopausal hormone replacement therapy (HRT)
Low-dose OCPs in premenopausal women and certain HRT in postmenopausal women may cause breakthrough bleeding. An IUD can sometimes cause spotting due to tissue irritation.

Did you recently start taking birth control pills?

Do you have an IUD?

Other possible factors associated with irregular periods

Irregular periods can occur in conjunction with uterine fibroids, polyps, infections, malignancies, systemic disorders (e.g., liver or kidney disease, blood-clotting abnormalities), medication side effects, or recently-inserted IUDs. If your periods have been irregular for a while and none of these explanations seems to fit, consult your healthcare practitioner right away to schedule a physical exam and lab tests to rule out more serious issues.

Natural approaches to balancing hormones and regulating periods

When it comes to balancing your hormones, you have more control than you may realize. After ruling out potentially serious issues, many doctors treat irregular periods with medication (e.g., birth control pills). These prescribed hormones fill in for your own hormones. Though this generally makes your periods run like clockwork, birth control pills can produce side effects without resolving the root source of the problem.

If the abnormal bleeding you’re experiencing is related to lack of ovulation that results in estrogen ‘dominance,’ supplemental progesterone can help control heavy bleeding and/or regulate your period. Several medicinal herbs, such as chasteberry, are also effective for regulating periods and boosting your own progesterone. Either of these approaches can help during perimenopause when progesterone is often low compared to estrogen. And if hypothyroidism is responsible for heavier periods, supplemental thyroid hormone can help.

Addressing irregular periods — get started today

Help restore regular periods with three simple adjustments to your diet:

  • Cut back on sugar and starches — diets high in sugars and starches may lead to insulin imbalances that affect estrogen and progesterone levels, and worsen polycystic ovary syndrome (PCOS).
  • Eat adequate protein — protein helps your body detoxify and metabolize hormones.
  • Get enough vitamins and minerals — good hormonal balance depends on adequate intake of B vitamins, magnesium and vitamin C (chronic stress can deplete these). Vitamins E and A, the mineral zinc, and essential fatty acids are also important. Add a high-quality multi-vitamin/mineral formula every day to ensure you’re taking in these key nutrients.

You may not be able to eliminate all the stressors in your life but you can achieve a healthy balance with relaxation practices like yoga and meditation, regular exercise, plenty of sleep, and good, consistent nutrition. Your endocrine system is extremely sensitive to disruption, but it’s also resilient and will respond quickly to healthy lifestyle and diet changes.

A positive outlook can have a major impact as well — don’t discount the power of believing you can improve your health and well-being. Make sure you schedule regular checkups, including an annual physical exam, especially if your periods don’t get back to normal.


Kahn A. What causes dysfunctional uterine bleeding? August 7, 2012. Healthline Web site.

Hudson T. Women’s Encyclopedia of Natural Medicine. Lincolnwood, IL: Keats Publishing; 1999.

Wathen PI, Henderson MC, Witz CA. Abnormal uterine bleeding. Med Clin North Am. 1995;79(2):329-344.

Pannill M. Polycystic Ovary Syndrome: An Overview. Topics in Advanced Practice Nursing eJournal. 2002;2(3). Available at Medscape: https://www.medscape.com/viewarticle/438597. Accessed May 27, 2015.

Mah PH. Hyperprolactinemia: Etiology, Diagnosis, and Management. Semin Reprod Med. 2002;20(4). Available at Medscape: https://www.medscape.com/viewarticle/447780. Accessed May 27, 2015.

University of Kansas School of Medicine–Wichita. Contemporary Concepts in Managing Menorrhagia. Medscape General Medicine. 1996;1(1). Available at: https://www.medscape.com/viewarticle/718193. Accessed May 27, 2015.

Last Updated: November 27, 2022
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