Regular Periods Don’t Always Mean Everything Is Fine, Says Gynaecologist

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A regular period is generally a reassuring sign. But it does not mean that everything related to reproductive or overall health is necessarily normal.

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Women can have predictable menstrual cycles and still have conditions such as anaemia, PCOS, endometriosis, thyroid disorders, fibroids or declining ovarian reserve. Cycle regularity tells us something about the menstrual and hormonal system, but it does not give a complete picture of reproductive health. We spoke to Dr Anuradha, Consultant - Obstetrics & Gynaecology, Prayag Hospitals, who explained what menstrual regulairity can and cannot tell you.

What a Regular Cycle Tells You

For most adults, a menstrual cycle occurring approximately every 24-38 days, with relatively little variation from one cycle to another, is considered regular.

"A predictable cycle suggests that the hormonal communication between the brain, pituitary gland and ovaries is functioning reasonably well. However, regular bleeding does not necessarily confirm normal ovulation, adequate ovarian reserve or the absence of an underlying condition," said Dr Anuradha.

Regular Periods Can Coexist With Ovulation Problems

Having monthly bleeding does not always prove that ovulation is occurring normally every month.

"Some women with apparently regular cycles may have subtle ovulatory dysfunction. This becomes particularly relevant when a woman is trying to conceive and pregnancy is taking longer than expected. In such cases, fertility assessment may be appropriate even when periods arrive on time," added Dr Anuradha.

PCOS Can Occur With Regular Cycles

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Polycystic ovary syndrome (PCOS) is one of the most common endocrine disorders in women of reproductive age. Irregular or infrequent periods are common, but regular cycles do not completely rule out PCOS.

The Rotterdam criteria are widely used for diagnosis. After excluding other conditions that can cause similar symptoms, a woman generally needs two of three features:

• Ovulatory dysfunction, usually reflected by irregular or infrequent periods
• Clinical or biochemical hyperandrogenism, such as excess facial or body hair, persistent acne, scalp hair thinning or elevated androgen levels
• Polycystic ovarian morphology on ultrasound, based on accepted criteria for follicle number and/or ovarian volume

A woman may therefore have PCOS despite apparently regular cycles. For example, she may have evidence of hyperandrogenism and polycystic ovarian morphology while continuing to have relatively predictable periods.

At the same time, polycystic-appearing ovaries on ultrasound alone do not establish a diagnosis of PCOS.

Persistent acne, unwanted facial or body hair, scalp hair thinning, central weight gain or evidence of insulin resistance should be discussed with a doctor even when periods are regular.

Ovarian Reserve Can Decline While Periods Remain Regular

Egg number declines gradually with age, while menstrual cycles can remain regular for years.

Regular periods therefore do not guarantee a high ovarian reserve or preserved fertility.

"Women planning pregnancy, particularly those approaching or moving through their mid-to-late thirties, may benefit from an individual fertility assessment. Depending on the clinical situation, this may include antral follicle count on ultrasound and AMH testing," explained Dr Anuradha.

AMH is a marker of ovarian reserve. It does not measure egg quality and cannot by itself predict whether a woman will conceive.

Heavy Periods Can Cause Anaemia

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A period can be regular and still be excessively heavy.

Fibroids, adenomyosis, endometrial polyps and other conditions can cause heavy menstrual bleeding. Repeated blood loss can lead to iron deficiency and anaemia.

Persistent tiredness, breathlessness, dizziness, reduced exercise tolerance, headaches, pallor or increased hair shedding should not simply be dismissed as part of having a "normal period."

Severe Period Pain Should Not Be Dismissed

Endometriosis can occur in women with completely regular menstrual cycles.

"Period pain that interferes with work, exercise, sleep, relationships or everyday activities warrants medical evaluation. Pain during intercourse, chronic pelvic pain, or bowel or bladder symptoms that worsen around menstruation can also require investigation," warned Dr Anuradha.

Severe menstrual pain is not something women should simply be expected to tolerate.

Thyroid Disorders Do Not Always Disrupt the Cycle

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Thyroid disorders can affect menstruation, but periods do not necessarily become irregular.

"A woman may continue to have relatively predictable cycles while experiencing persistent fatigue, unexplained weight changes, constipation, increased sensitivity to cold, palpitations, heat intolerance, mood changes or changes in her hair and skin," added Dr Anuradha.

When symptoms suggest thyroid dysfunction, thyroid testing may be appropriate.

When Should You See a Doctor?

Even when periods arrive regularly, medical evaluation is appropriate if you have:

• Bleeding that requires changing a pad or tampon every one to two hours
• Very large or frequent blood clots
• Bleeding between periods
• Bleeding after intercourse
• Severe period pain that interferes with normal activities
• A persistent change in your usual cycle pattern
• New or worsening acne or unwanted hair growth
• Sudden unexplained weight change
• Persistent fatigue, dizziness or pallor
• Difficulty conceiving despite regular cycles

"For women trying to conceive, fertility evaluation is generally recommended after 12 months of regular unprotected intercourse if under 35, and after six months if aged 35 or older. Earlier assessment may be appropriate when there are known risk factors or concerning symptoms," advised Dr Anuradha.

Track More Than the Date of Your Period

A period-tracking app or simple diary can provide useful information during a medical consultation.

Track the first day of bleeding, cycle length, number of bleeding days, flow, clots, pain, spotting between periods and symptoms such as acne, mood changes or breast tenderness.

Keeping a record for about three months can give your doctor a clearer picture than trying to recall several cycles from memory.

What Might an Evaluation Include?

The evaluation depends on symptoms, age and reproductive goals.

Depending on the situation, a doctor may recommend:

• Complete blood count and iron assessment when anaemia is suspected
• Thyroid testing when clinically indicated
• Pelvic ultrasound for structural abnormalities or ovarian assessment
• Androgen testing when PCOS or hyperandrogenism is suspected
• Glucose or HbA1c testing when metabolic risk factors are present
• Prolactin or other hormonal investigations when indicated
• AMH and antral follicle count when assessment of ovarian reserve is clinically relevant

AMH should not be used alone to diagnose PCOS. PCOS should be diagnosed using appropriate clinical, biochemical and/or ultrasound criteria after other causes have been excluded.

"Cervical cancer screening with the appropriate Pap test and/or HPV-based screening should also be undertaken according to age and applicable screening guidelines. Cervical screening is separate from menstrual regularity," added Dr Anuradha.

Regular Periods Are One Part of the Picture

A regular menstrual cycle is a positive sign, but it is only one part of reproductive health.

Pain, bleeding pattern, iron levels, ovulation, hormonal and metabolic health, ovarian reserve, pelvic health and fertility all matter.

So, "My period is on time" is a good starting point, but it is not a complete health assessment.

"Pay attention to changes in pain, flow, energy levels, skin, hair, weight and fertility. Your menstrual cycle provides useful information every month. Understanding those changes and discussing persistent symptoms with a doctor can help identify problems earlier," concluded Dr Anuradha/

Regular cycles are reassuring. They are not, by themselves, proof that everything is normal.

Disclaimer: The information provided in this article is for general informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or a qualified healthcare provider with any questions you may have regarding a medical condition.