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Irregular Menstrual Cycle in Perimenopause: Why It Happens and What to Do

Mujer revisa calendario menstrual en cama

Marta Hifas da Terra |

An irregular menstrual cycle can be one of the first signs that your body is entering the transition towards menopause. Periods that were once predictable may become shorter, longer, heavier, lighter or less frequent – and you may miss a period for a month or two before your cycle returns.

These changes are often a normal part of perimenopause, but irregular bleeding should not automatically be put down to it. Understanding what is normal and which situations need a medical check is essential.

For an overview of this stage of life, see our complete guide to perimenopause.

Why does the cycle become irregular?

Perimenopause is a gradual transition that can begin several years before the final period. As ovarian function changes, ovulation becomes less regular and oestrogen can fluctuate considerably. When ovulation does not occur, progesterone production is reduced, which affects the development and shedding of the womb lining. According to the NHS, periods may become more or less frequent, and bleeding heavier or lighter. Menopause is defined as 12 consecutive months without a period.

You may notice periods closer together or further apart, heavier or lighter bleeding, periods lasting more or fewer days, an occasional missed period, or changes in premenstrual symptoms. Pregnancy, hormonal contraception, weight changes, intense exercise, stress, thyroid problems and conditions such as PCOS can also affect your cycle.

When to speak to your GP

  • Bleeding between periods or after sex.
  • Very heavy periods – for example, needing to change a pad or tampon every 1–2 hours.
  • Bleeding lasting more than seven days.
  • A sudden or significant change from your usual pattern.
  • Bleeding that affects your daily life.
  • Any bleeding after 12 months without a period (postmenopausal bleeding) – this should always be checked.

Keeping a record of your cycle – start date, length, amount of bleeding and any spotting – can be very helpful for your GP.

Looking after yourself

No diet, supplement or lifestyle change can make your hormones behave as they did in your twenties or thirties. Instead, focus on a varied diet with vegetables, fruit, pulses, wholegrains, nuts, seeds and good-quality protein; regular physical activity; time outdoors; relaxation and good sleep habits. NICE recommends an individualised approach to menopause, including discussing the benefits and risks of hormone replacement therapy (HRT) where appropriate.

Fertility has not necessarily ended

Ovulation can still occur during perimenopause, even when periods are unpredictable. The NHS advises continuing to use contraception if you do not wish to become pregnant.

Hifas-Menopause

Hifas-Menopause is a hormone-free food supplement that combines organic Reishi, Lion's Mane and Cordyceps sinensis with Ashwagandha root extract, green tea extract, live cultures, vitamins B6 and D and zinc. Vitamin B6 contributes to the regulation of hormonal activity and to normal psychological function. Vitamin D contributes to the maintenance of normal bones, and zinc contributes to the normal function of the immune system. Take two capsules a day as directed on the label.

If you are taking any medication, are under medical supervision or have a hormone-sensitive condition, please speak to your doctor before taking any food supplement. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.

Frequently asked questions

Answers to the most common questions

Perimenopause usually occurs in midlife, and menopause typically takes place between the ages of 45 and 55. However, the timing can vary considerably. If you experience significant menopausal symptoms or changes in your periods before the age of 45, discuss them with your healthcare professional.

There is no set timeframe. Perimenopause is a transitional stage and can last for several years.

Consult your doctor if your periods have become irregular, especially if the change is significant or persistent. Medical assessment is particularly important if you experience bleeding between periods, bleeding after sex, very heavy bleeding or periods that last longer than seven days.

No. Ovulation can still occur during perimenopause, even when periods are irregular. If you do not wish to become pregnant, contraceptive options for both partners should be reviewed until menopause has been reached.

Bleeding between periods, bleeding after sex, unusually heavy bleeding or bleeding that lasts longer or is significantly heavier than your usual pattern should be assessed by a healthcare professional.

During perimenopause, you may go several months without a period as ovulation becomes less predictable. However, pregnancy, thyroid disorders, weight changes, stress and other health conditions can also cause missed periods. If you have not had a period for three consecutive cycles or you are concerned about any change, seek medical assessment.

Stress can affect menstrual patterns, although it is not the only possible explanation. During perimenopause, the hormonal transition itself can cause cycles to become irregular, while stress and sleep disturbances may increase the overall burden of symptoms.

There is no proven natural approach that can reliably restore a regular menstrual cycle during perimenopause. A varied, nutrient-rich diet, regular strength and aerobic exercise, adequate rest and stress management support general health. If menstrual changes are persistent or concerning, assessment by a healthcare professional should always be the first step.

References