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Reasons for Irregular Period Cycle: 7 Common Causes

Irregular periods can result from birth control methods containing hormones, endometriosis causing tissue growth outside the uterus, PCOS creating ovarian cysts with high androgen levels, thyroid conditions affecting hormone balance, uterine fibroids developing on uterine walls, perimenopause preceding menopause, and stress hormones interfering with reproductive regulation.

  • 23 Apr 2025
  • 3 min read
  • 16 views

Menstruation, or a period, is the monthly shedding of the uterine lining. A cycle generally lasts between 21 and 35 days. During this time, many girls and women experience symptoms such as cramps, fatigue, and mood swings. A period is considered irregular if it occurs too early or too late, skips a cycle, or varies significantly in length.

Read on to discover some reasons for irregular period cycles. 

Reasons for period irregularity

There can be many reasons for irregular menses. Some of the causes of irregular menstruation are:

  1. Birth control: One of the main reasons for period irregularity is the usage of birth control, such as pills, patches, intrauterine devices, or implants. These contraceptives contain hormones that prevent ovulation or implantation, which can lead to lighter menstrual bleeding and occasional spotting between periods.
  2. Endometriosis: A condition in which the tissue that generally lines the uterus to grow outside of it, often attaching to the fallopian tubes or ovaries. This causes irregular menstrual cycles, prolonged periods, abnormal bleeding and severe cramps.
  3. Polycystic ovary syndrome: Another cause of irregular cycle is polycystic ovary syndrome (PCOS), a condition in which cysts develop in the ovaries. People with PCOS produce higher-than-normal levels of androgen, a sex hormone that can interfere with ovulation, leading to irregular or missed periods.
  4. Thyroid conditions: An underactive thyroid, or hypothyroidism, causes longer, heavier periods. While an overactive thyroid, or hyperthyroidism, causes shorter, lighter periods.
  5. Uterine fibroids: Fibroids or growths on the wall of the uterus are a cause of irregular menstrual period. Women with fibroids can suffer from irregular and heavy periods.
  6. Perimenopause: Another reason behind irregular periods is perimenopause, which begins 4-8 years before menopause. The menstrual cycle may get longer or shorter at different points during this period.
  7. Stress: Stress hormones, adrenaline and cortisol, can interact with the sex hormones that regulate menstruation and cause irregular periods.

Conclusion

Irregular periods can occur for various reasons. If they happen consistently, regular medical check-ups can help identify the cause and treat it early. Having a suitable health insurance policy can cover expenses related to diagnosis, consultations and treatment. It also provides financial protection in case of unexpected medical emergencies, ensuring peace of mind.



Disclaimer: The information provided in this blog is for educational and informational purposes only. It is not intended as a substitute for professional advice, diagnosis, or treatment. Please consult your general physician or another certified medical professional for any questions regarding a medical condition. Relying on any information provided in this blog is solely at your own risk, and ICICI Lombard is not responsible for any effects or consequences resulting from the use of the information shared.

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