Irregular periods are one of the most common reasons women seek advice from a gynaecologist. While occasional variation is completely normal, persistent irregularity can sometimes indicate an underlying hormonal or structural issue that should be assessed.
What is a “normal” menstrual cycle?
A typical menstrual cycle occurs every 21 to 35 days, with bleeding lasting between 3–7 days. However, every woman’s cycle is slightly different.
You may have irregular periods if:
- Your cycle length changes significantly month to month
- You frequently skip periods
- Your periods come more often than every 21 days
- You experience very heavy or prolonged bleeding
Common causes of irregular periods
Hormonal imbalance
Fluctuations in oestrogen and progesterone can disrupt ovulation. This is particularly common during:
- Adolescence
- After pregnancy
- Perimenopause
Polycystic ovary syndrome (pcos)
Pcos is one of the leading causes of irregular cycles and may also present with:
- Acne
- Weight gain
- Excess facial or body hair
Stress and lifestyle factors
High stress levels, significant weight loss, or excessive exercise can suppress ovulation, leading to missed or delayed periods.
Thyroid disorders
An underactive or overactive thyroid can affect hormone regulation and disrupt your cycle.
Uterine conditions
Fibroids or polyps can cause heavy or irregular bleeding.
When should you see a specialist?
You should seek medical advice if:
- Your periods stop for more than 3 months (and you’re not pregnant)
- You experience bleeding between periods
- Your periods suddenly become very heavy or painful
- Your cycle becomes consistently unpredictable
How are irregular periods investigated?
A consultation may include:
- Detailed medical history
- Blood tests (hormones, thyroid function)
- Pelvic ultrasound scan
Treatment options
Treatment depends on the cause but may include:
- Hormonal regulation (e.g. Contraceptive pill)
- Lifestyle modifications
- Management of underlying conditions such as pcos or thyroid disorders
Final thoughts
While irregular periods are common, they shouldn’t be ignored if persistent. Early assessment can help identify underlying causes and protect your long-term reproductive health.
Faqs
Can irregular periods fix themselves?
Yes, especially if caused by stress or temporary hormonal changes.
Do irregular periods always mean infertility?
No—but they can affect ovulation, so it’s worth assessing.
Should i track my cycle?
Yes—tracking helps identify patterns and supports diagnosis.
If you would like to discuss any concerns you have on this subject, please contact the London Gynaecologist to book an appointment
