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Irregular Periods: What Causes It and Is It Dangerous?


18 May 2025
Updates

Irregular menstruation is a common issue many women face. There are multiple causes and contributing factors behind this condition. In this article, we’ll explore the causes, symptoms, possible complications, treatment options, and preventive measures for irregular periods.

What is Irregular Menstruation?

Irregular periods can present in several forms, such as:

  • Inconsistent cycle lengths
  • Unusually light periods
  • Periods that arrive too early or too frequently

These irregularities are often caused by hormonal imbalances, stress, medication use, or conditions like polycystic ovary syndrome (PCOS).

Normal Menstrual Cycle

A typical menstrual cycle is around 28 days but can range from 21 to 35 days. Consistency in timing is more important than exact length. Irregularity is more common during the first few years of menstruation or as a woman approaches menopause.

Causes of Irregular Periods

1. Lifestyle Factors

  • Intense Exercise: Over-exercising can disrupt hormone levels and menstrual cycles.
  • Stress: Emotional or mental stress affects hormone secretion and can delay or suppress menstruation.
  • Disordered Eating: Conditions like bulimia can impair reproductive function.

2. Perimenopause

As women approach menopause (typically between ages 45–55), estrogen levels decline, causing irregular ovulation and eventually the cessation of periods.

3. Hormonal Imbalance

Estrogen and progesterone imbalances—often caused by being underweight or overweight—can directly impact the menstrual cycle.

4. Anovulation (No Ovulation)

This condition may stem from chronic stress or underlying medical conditions that disrupt egg maturation, leading to missed or irregular periods.

5. Medication

Certain medications, including antidepressants, antipsychotics, thyroid drugs, anti-seizure meds, chemotherapy, and blood pressure medications, can affect menstrual regularity.

6. Underlying Health Conditions

  • PCOS: Causes elevated testosterone, delaying or preventing ovulation.
  • Endometriosis: Causes excess uterine lining growth, resulting in heavier periods.
  • Thyroid Disorders: Affects metabolism and ovulation regulation.
  • Pelvic Inflammatory Disease (PID): Infection of reproductive organs that can disrupt menstrual function.

When to See a Doctor

Seek medical attention if you experience:

  • Very heavy or prolonged periods
  • Extremely light periods
  • Bleeding between cycles
  • Severe menstrual cramps
  • Nausea or vomiting during periods
  • Periods lasting more than 7 days

Diagnosis of Irregular Periods

Doctors may use the following to determine the cause:

  • Medical History Review: Including menstrual history, pregnancy, contraception, and gynecological screenings.
  • Blood Tests: To check hormone levels like Prolactin, LH, and FSH.
  • Ultrasound: To detect abnormalities in the uterus and ovaries using high-frequency sound waves.

Possible Complications

  • Anemia: Caused by excessive or frequent bleeding leading to iron deficiency.
  • Osteoporosis: Low estrogen levels can weaken bones.
  • Heart Disease: Estrogen helps protect the heart; imbalances raise risk.
  • Endometrial Cancer: Excess estrogen thickens the uterine lining, increasing cancer risk.

Treatment for Irregular Periods

  1. Weight Management
    Maintain a healthy weight—being underweight or overweight can disrupt hormone production and ovulation.
  2. Stress Management
    Reduce stress through relaxation, laughter, and hobbies to stabilize hormonal balance.
  3. Medications
    Doctors may prescribe hormone supplements to regulate periods, particularly if irregularity is due to weight or lifestyle issues.

Irregular Periods and Infertility

Irregular menstruation often indicates ovulation problems (anovulation). Without regular ovulation, progesterone is not produced properly, and the uterine lining doesn’t shed predictably, causing cycle disruption. Without ovulation, conception is not possible, making this a significant cause of infertility.

Preventing Irregular Periods

    • Avoid stress or manage it with leisure activities
    • Get 7–9 hours of sleep per night
    • Eat a balanced diet with all five food groups
    • Maintain a healthy weight
    • Avoid smoking, alcohol, and excessive caffeine
    • Exercise regularly but avoid overexertion

Frequently Asked Questions (FAQs)

Q: No period but experiencing vaginal discharge—is that normal?
A: It can be normal. Vaginal discharge helps flush out bacteria. However, discharge with odor, unusual color, or accompanied by itching may indicate an infection and requires medical attention.

Q: Period lasting over a month—what’s the cause?
A: Potential causes include:

  • Hormonal imbalance
  • Uterine issues (e.g., fibroids, cancer, PCOS, endometriosis, PID)
  • Medication side effects (e.g., blood thinners, chemotherapy, anti-inflammatories, IUDs)

Q: Can I take herbal pills (Ya Satree) if I miss my period?
A: It is not recommended. Some contain plant-based hormones that can stimulate the uterine lining but may also cause hormonal imbalances. Consult a doctor for proper treatment.

Conclusion

Irregular menstruation is a condition where the menstrual cycle deviates from the norm. Missing a period for 3 months is termed amenorrhea, while 1–2 months of delay is late menstruation. Common causes include pregnancy, stress, weight fluctuations, medication, or menopause. It may also indicate conditions like PCOS or premature ovarian failure and is a key contributor to infertility.

If you have concerns or need more information, feel free to contact us via Line@ : @beyondivf

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The Biological Clock

This tool indicates:

  • Natural conception per month if you have no fertility issues
  • IVF success rate at the same age
  • When to seek help after months of unsuccessful attempts

If you are concerned at any stage – we recommend booking a doctor appointment or a free nurse consultation. The sooner you make a plan the better your chances in the long term.

When to seek advice early

  • If you have polycystic ovaries, endometriosis, or have been through a cancer diagnosis; we recommend you get in touch quickly so we can talk you through all your options and give you the greatest possible chance of success.
  • If you’re a single woman considering motherhood in the future; it’s best to approach us early and consider egg freezing as this can be an option for you while you have a higher ovarian reserve and healthier eggs.
Set your age and the months you’ve been trying to conceive
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Your chance of having a baby per month for fertile couples
Your chance of having a baby per IVF cycle (if experiencing infertility)

Body Mass Index calculator

Being overweight or underweight can reduce fertility, so it is important to keep your body weight within the normal healthy range.

Body Mass Index (BMI) is an indication of your body weight and can be calculated by dividing weight by height. You should aim for a BMI of between 20 and 25, as this will optimise your chances of conception.

Woman’s BMI below 19

Even in these modern times, nature knows best. If a woman's BMI falls below 19, the body senses famine and ovulation is switched off to prevent the risk of having a baby with malnutrition. Excessive exercise can reduce body fat and increase muscle mass to a point where periods cease for the same reason. Risk of miscarriage is also increased in women with a low BMI.

Being underweight

If a woman's BMI falls below 19, the body senses famine and ovulation is switched off to prevent the risk of having a baby with malnutrition. Excessive exercise can reduce body fat and increase muscle mass to a point where periods cease for the same reason. Risk of miscarriage is also increased in women with a low BMI.

BMI’s greater than 30

This can reduce fertility by 50%. Pregnancy for women with a 30+ BMI is often associated with problems such as maternal diabetes, high blood pressure, big babies and increased risk of caesarean section.

Add your height and weight to calculate your BMI