Symptom Guide · Irregular Periods
Why are my periods irregular?
An occasional early or late period is normal. But if your cycles are consistently shorter than 21 days, longer than 35 days, or completely unpredictable, your body is telling you something — and it is worth finding out what.
What counts as an irregular period?
A normal cycle is 21 to 35 days, counted from the first day of one period to the first day of the next. Your cycle is considered irregular if it regularly falls outside this range, if the gap between periods keeps changing by more than a week, or if you skip periods altogether without being pregnant.
What are the most common causes of irregular periods?
In young women, PCOS (polycystic ovary syndrome) is the most common cause — affecting roughly 1 in 5 Indian women. Other frequent causes include thyroid problems, significant stress, sudden weight gain or loss, excessive exercise, breastfeeding, and certain medicines. In women over 40, irregular cycles are often the first sign of perimenopause.
Can stress really delay my period?
Yes. Stress hormones interfere with the signals between your brain and ovaries that control ovulation. A stressful month can delay a period by days or even weeks. However, if your periods stay irregular for more than two or three cycles, do not keep blaming stress — get checked, because treatable conditions like PCOS and thyroid disorders cause the same pattern.
What tests will the doctor do for irregular periods?
Usually a detailed history, a pelvic ultrasound, and blood tests — thyroid function, prolactin, and hormones like LH, FSH, and testosterone. These identify the cause in the great majority of cases. Treatment then depends on the cause: cycle regulation, thyroid treatment, lifestyle changes, or fertility-focused care if you are trying to conceive.
Can I get pregnant with irregular periods?
Yes, though it may take longer because ovulation is unpredictable. If you have irregular cycles and have been trying to conceive for six months or more, see a gynaecologist — regularising ovulation is often straightforward once the cause is known.
See a doctor promptly if you have
- No period for 3 months or more (and you are not pregnant)
- Cycles consistently shorter than 21 days
- Bleeding between periods or after intercourse
- Irregular periods along with acne, excess facial hair, or rapid weight gain
- Irregular periods while trying to conceive
This page is general information, not a diagnosis. Only a consultation and examination can tell you what is causing your symptoms.
Worried about this symptom?
Consult Dr. Madhumita Das Mazumdar — MD (OBG), 30+ years of experience — at the clinic in Beltola, Guwahati, or on WhatsApp from anywhere in Assam.