Irregular periods (2024)

Irregular periods are not usually a sign of a problem. But speak to a GP if your periods are irregular or your normal pattern of periods changes.

Check if you have irregular periods

The average gap between periods starting (the menstrual cycle) is 28 days. It can sometimes be a bit shorter or longer.

A woman's periods are irregular if the gap between them is less than 21 days or more than 35 days.

Irregular periods can affect anyone who has periods.

It's more likely for your periods to be irregular when they first start during puberty, and when you're nearing menopause.

Keeping track of your periods

Using an app or a diary to keep track of your periods can help you see if they're irregular.

Day 1 of your menstrual cycle is the first day of your period. The last day of your cycle is the day before your next period.

Causes of irregular periods

Common causes of irregular periods include:

Sometimes, conditions like polycystic ovary syndrome (PCOS) and an underactive thyroid gland can cause irregular periods.

Non-urgent advice: See a GP if:

  • your periods are irregular
  • your periods last longer than 7 days
  • you have irregular periods and other symptoms like weight gain, tiredness, hair growth on your face and dry or oily skin
  • your periods are irregular and you're struggling to get pregnant

Treatments for irregular periods

Treatment is not always needed for irregular periods.

The GP may refer you to a specialist (gynaecologist) if you need tests to find out what's causing your irregular periods. If treatment is needed it will depend on the cause.

For example, if a condition like polycystic ovary syndrome is causing irregular periods, the combined pill may help make your periods more regular.

Trying for a baby

Getting pregnant can be more difficult if you have irregular periods because you might not release an egg (ovulate) regularly.

It can help to have sex every 2 or 3 days throughout your cycle without using contraception.

If you're struggling to get pregnant, hormone medicine or fertility treatment may be recommended.

Read more about trying to get pregnant.

Video: Menstrual cycle

This animation explains in detail how the menstrual cycle works.

Media last reviewed: 21 October 2023
Media review due: 21 October 2026

Page last reviewed: 26 July 2022
Next review due: 26 July 2025

Irregular periods (2024)

FAQs

Irregular periods? ›

A woman's periods are irregular if the gap between them is less than 21 days or more than 35 days. Irregular periods can affect anyone who has periods. It's more likely for your periods to be irregular when they first start during puberty, and when you're nearing menopause.

What are the main causes of irregular periods? ›

Other common causes of irregular periods include:
  • Having an intrauterine device (IUD)
  • Changing birth control pills or using certain medications.
  • Too much exercise.
  • Polycystic ovary syndrome (PCOS)
  • Pregnancy or breastfeeding.
  • Stress.
  • Overactive thyroid (hyperthyroidism) or underactive thyroid (hypothyroidism)
May 14, 2023

Should I be worried if my period is irregular? ›

Kaufman says if your periods are consistently irregular, they'd recommend seeing your doctor or gynecologist. Here is what to watch for: Consistently having periods closer than 24 days apart. Consistently having periods longer than seven days.

How irregular is a normal period? ›

Normal menstrual cycles range from 21 to 35 days long, with an average of 28 days. Periods usually last from 3 to 7 days. If you always have approximately the same number of days between periods, your menstrual cycle is regular. If your periods don't follow a pattern, they are irregular.

Do irregular periods mean infertility? ›

Irregular periods are caused by ovulation problems that can result in infertility. The primary ways a woman's periods can be irregular are having no period (amenorrhea) and having them infrequently (oligomenorrhea).

What deficiency causes irregular periods? ›

Various international studies demonstrate that women with irregular period cycles and cycles longer than 35 days usually have Vitamin D deficiency. Vitamin D helps in regulating the hormones affecting the ovarian functions.

How do I get my irregular period back to normal? ›

Making lifestyle changes to reduce or manage stress and maintain a healthy body weight may help regulate periods. Meditation and yoga are effective stress management methods. Regular exercise and a healthful diet can help people manage their weight. Getting enough vitamin D may also support a healthy menstrual cycle.

What should I drink if my period is irregular? ›

1: Ginger tea

Ginger is beneficial for different diseases and symptoms, including irregular periods. Regular consumption of raw ginger can help to regulate your periods. Ginger contains gingerol that helps lower inflammation in the body. It helps in contracting the uterine muscles and facilitates hormonal balance.

What do obgyns do for irregular periods? ›

Depending on the underlying cause of your irregular cycles, your doctor may suggest one or more of the following treatments: Prescription medication. Losing or gaining weight (if irregularities are caused by weight-related issues). Hormonal therapies include but are not limited to, birth control.

At what age are irregular periods normal? ›

Irregular periods are more common when you first begin menstruating (around age 9 to 14) or during perimenopause (around age 50 or just before menopause).

What do irregular periods look like? ›

Signs of irregular periods can include: the number of days in between each of your periods is different and keeps changing. the amount of menstrual blood changes from one period to the next. your periods come closer together – less than 25 days from the start of one to the start of the next one.

When to see doctor for irregular periods? ›

If a woman is of reproductive age, any other change in her usual pattern by a week or more either way is abnormal, says Scher. Heavy bleeding, bleeding between periods -- including light "spotting" -- and missing a period should all be reported to a doctor, he advises.

What are the side effects of having irregular periods? ›

Side effects of irregular periods might include:
  • Heavy bleeding.
  • Light bleeding.
  • Intense pain or cramping.
  • Nausea or vomiting.
  • Bleeding or spotting between menstruation.
  • Bleeding or spotting after sex.

Which hormone is responsible for irregular periods? ›

LH (Luteinizing Hormone) and FSH (Follicle Stimulating Hormone) produced by pituitary gland stimulate the ovaries to produce estrogen and progesterone and will cause the release of the egg. When there are fluctuations in LH, FSH, estrogen, and progesterone, the menstruation cycle gets irregular.

What blood tests are done for irregular periods? ›

Blood Tests for Late Periods

The blood tests include testing the levels of thyroid-stimulating hormone (TSH), prolactin, cortisol, follicle-stimulating hormone (FSH), testosterone, 17-hydroxyprogesterone, and DHEA. The fluctuations in the levels of these hormones can lead to irregular periods.

Why is my period not flowing well? ›

Body weight changes, exercise, and stress can all alter menstrual flow, causing light periods. Periods that are lighter than usual are not normally a cause for concern. People often find that their menstrual flow varies from month to month, and some months are simply lighter than others.

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