Irregular Periods In Young Girls Could Be More Than Just A Passing Phase

For many parents, a daughter's first few years of menstruation come with a familiar piece of advice: ‘Give it time, her hormones are settling down.’ Often, that is exactly what is happening. Menstrual cycles can be unpredictable in the early years after the first period as the reproductive system matures. But sometimes, persistent irregularity is a signal worth investigating rather than waiting out.

That is the message emerging from an ongoing school-based screening programme at the All-India Institute of Medical Sciences (AIIMS), Delhi. Since around 2023, girls in seven government and private schools have been screened, with close to 4,000 girls included so far. Nearly one in five reported some form of menstrual irregularity. AIIMS researchers have estimated that around 3 to 5 per cent of those screened may have Polyendocrine Metabolic Ovarian Syndrome (PMOS), the condition that was commonly known as Polycystic Ovary Syndrome (PCOS) until recently. The numbers are preliminary and the screening programme is ongoing, but they highlight the fact that a menstrual cycle can also offer clues about a young person's overall health.

What Counts As An Irregular Period?

Some irregularity is normal, particularly during the first year after menstruation begins. The international evidence-based guideline for adolescents defines the first year after menarche as a period when irregular cycles can be part of normal pubertal transition. Between one and three years after the first period, cycles occurring less than 21 days apart or more than 45 days apart warrant attention. More than 90 days without a period, even once after the first year, is also a reason for assessment. After three years from menarche, cycles shorter than 21 days or longer than 35 days, or fewer than eight periods in a year, are considered irregular. A girl who has not had her first period by age 15 should also be evaluated.

The point is not that every irregular cycle means PMOS. A young girl's periods can be affected by many things such as the normal hormonal changes of puberty, nutritional deficiencies, significant changes in weight, excessive exercise, eating disorders, thyroid problems, other hormonal conditions and psychological stress. In adolescents, doctors also need to consider conditions that can mimic PMOS/PCOS before making a diagnosis.

Can Stress Affect Periods?

The brain and reproductive system communicate continuously through hormones. Significant psychological stress, inadequate sleep, under-eating, excessive exercise and other forms of physical or emotional strain can interfere with the hormonal signals involved in ovulation. Research among adolescent girls in India has found associations between higher stress, poor sleep and abnormal menstrual patterns. More recent population-based research has also linked school burnout with menstrual irregularity in adolescents.

Take academic pressure seriously, not because studying itself causes PCOS, but because a high-pressure routine can sometimes come with several factors that affect menstrual health such as chronic stress, late nights, inadequate sleep, skipped meals, restrictive dieting, little physical activity or, at the other extreme, intense exercise. If a teenager's periods become irregular around board examinations, for instance, it may be tempting to dismiss the change as ‘exam stress’. Sometimes, it may settle when the stressful period passes. But persistent irregularity should not automatically be attributed to stress.

When Should Parents Book A Doctor’s Appointment?

Don't wait indefinitely for periods to normalise if the pattern keeps repeating or there are other symptoms. Parents should ideally arrange a medical assessment if their daughter:

• Goes more than 90 days without a period after the first year of menstruation
• Continues to have cycles more than 45 days apart during the first three years after menarche
• Has fewer than eight periods a year after the early pubertal transition
• Has periods lasting more than seven days
• Is bleeding so heavily that she needs to change a pad every one to two hours
• Has symptoms such as significant or worsening facial/body hair growth or severe acne alongside irregular periods;
• Has major changes in weight, persistent fatigue, cramps during periods or other symptoms suggesting a hormonal or nutritional problem
• Has not started menstruating by age 15
• 

Screening And Diagnosis

A screening programme can identify girls who may need further evaluation. It cannot however, establish that a girl has PMOS/PCOS. Diagnosing PCOS in adolescence is challenging because some features of normal puberty overlap with the syndrome. Current guidelines recommend looking for both persistent menstrual irregularity/ovulatory dysfunction and clinical or biochemical signs of excess androgens, after excluding other possible causes. Those signs can include excess facial or body hair, severe acne or elevated androgen levels on appropriate blood testing. An ultrasound is not a shortcut to diagnosis in a young teenager. Current adolescent guidance does not recommend using polycystic ovarian appearance on ultrasound to diagnose PCOS in adolescents, because multi-follicular ovaries can be a normal feature of puberty. This is one reason an experienced paediatrician, adolescent-medicine specialist, paediatric endocrinologist or gynaecologist can be valuable.

Why Does Early Identification Matter?

PCOS Or PMOS can involve androgen excess, insulin resistance and metabolic risk, as well as psychological symptoms. Identifying concerns during adolescence gives families an opportunity to address problems early, monitor changes and prevent a young girl from entering adulthood without understanding what is happening to her body. Treatment is also not synonymous with ‘putting her on medication’. For many adolescents, the foundation is a healthy, sustainable lifestyle which includes adequate nutrition, regular physical activity, sufficient sleep and attention to emotional wellbeing. This should also not become a campaign to make a girl lose weight. Current guidelines specifically emphasise reducing weight stigma and focusing on health. Where symptoms warrant it, doctors may prescribe medication. These are medical decisions, however, not treatments parents should start on their own.

Keep The Conversation Open At Home

Many girls do not tell their parents when periods disappear for months. Some worry that something is wrong with them, while others assume everyone has irregular periods. A few may be dealing with restrictive eating, excessive exercise, bullying, anxiety or academic pressure without telling an adult. Parents can start by asking simple questions casually. When was your last period? Are your cycles becoming more predictable? Is the bleeding unusually heavy? Have you noticed new acne or hair growth? Are you sleeping and eating normally? How stressed have you been? Keeping a simple record of the first day of each period can also help a doctor identify a pattern.

The larger lesson from the AIIMS screening is not that parents should panic about PCOS, but that menstrual health must be factored in. A late period may actually be nothing more than a late period and an irregular cycle in the first year may be completely normal. But when this irregularity persists, becomes pronounced or arrives alongside other symptoms, it is worth getting checked out.