Irregular Periods: Causes & When to See a Doctor

What Is Irregular Periods?

Irregular periods include cycles shorter than 21 days or longer than 35 days, missed periods, unpredictable timing, or significant changes in flow. While some irregularity is normal (especially in teens and perimenopause), persistent irregularity may indicate hormonal imbalances or other conditions.

Common Causes of Irregular Periods

• Stress
• PCOS (polycystic ovary syndrome)
• Thyroid disorders
• Extreme weight changes
• Excessive exercise
• Perimenopause

When to See a Doctor

See a gynecologist if periods are consistently irregular, you miss three or more periods, cycles are under 21 or over 35 days, or if bleeding is very heavy or lasts more than 7 days.

Warning Signs That Need Immediate Attention

Frequently Asked Questions

What causes irregular periods?

The most common causes are stress, PCOS, thyroid problems, extreme dieting or exercise, and perimenopause. Birth control and other medications can also affect cycle regularity.

Is it normal to have irregular periods?

Some irregularity is normal in the first few years of menstruation and during perimenopause. In between, cycles should be somewhat predictable. Consistent irregularity in your 20s-40s warrants evaluation.

Can stress cause missed periods?

Yes, stress can delay or cause you to skip periods entirely. The stress hormone cortisol suppresses reproductive hormones. Managing stress often restores regular cycles.

What is PCOS?

Polycystic ovary syndrome affects 1 in 10 women and causes irregular periods, excess androgen hormones, and sometimes ovarian cysts. It is treatable with lifestyle changes and medication.

How much does period irregularity evaluation cost?

A gynecologist visit costs $150-$400. Hormone blood tests cost $50-$300. An ultrasound costs $200-$800. OpenMyPro helps you find affordable women's health specialists.

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