Is My Period Normal? Understanding Irregular Cycles

A "normal" menstrual cycle has quite a broad range. While 28 days is often cited as average, cycles anywhere from 21 to 35 days are considered within normal limits.

It's also normal for cycles to vary somewhat throughout your reproductive life, being more irregular in the years after your first period and again as you approach menopause.

Irregular periods can result from many factors, ranging from temporary lifestyle influences to underlying medical conditions.

Common Causes

• Polycystic ovary syndrome (PCOS): The most common hormonal disorder in women of reproductive age, causing infrequent or prolonged periods.
• Thyroid disorders: Both overactive and underactive thyroid can disrupt menstrual patterns.
• Elevated prolactin: This hormone, when raised, can interfere with ovulation.
• Premature ovarian insufficiency: Early decline in ovarian function before age 40.
• Endometriosis: Can cause painful, heavy, or irregular bleeding.
• Uterine fibroids or polyps: Benign growths that can cause heavy or prolonged bleeding.

Lifestyle and Temporary Factors

• Significant weight changes (gain or loss)
• Excessive exercise
• Stress
• Travel and time zone changes
• Recent contraceptive changes
• Breastfeeding

The connection between irregular periods and fertility relates primarily to ovulation. Regular periods typically indicate regular ovulation, while irregular cycles may signal ovulation problems.

Infrequent ovulation (oligoovulation) means fewer opportunities for conception each year. If you're ovulating only 6 to 8 times per year instead of 12, your chances of conceiving in any given time period are reduced.

Absent ovulation (anovulation) prevents natural conception altogether. This can occur with very irregular or absent periods, common in conditions like PCOS.

However, irregular periods don't automatically mean infertility. Many women with somewhat irregular cycles still ovulate regularly enough to conceive. The key is understanding whether you're ovulating and, if not, addressing the underlying cause.

Important: If you have very irregular or absent periods and are trying to conceive, seeking advice earlier rather than later is sensible, as standard "wait 12 months" guidance assumes regular cycles.

Consider seeing a doctor if you experience:

• Cycles consistently shorter than 21 days or longer than 35 days
• Periods that have become significantly heavier or more painful
• Bleeding between periods or after intercourse
• Periods lasting longer than 7 days
• No period for 3 months or more (when not pregnant or breastfeeding)
• Periods that suddenly become irregular after being regular
• Severe pain that interferes with daily activities
• Needing to change pads or tampons more than every 1 to 2 hours

Additionally, if you're over 35 and have noticed your cycles becoming shorter or more irregular, this may warrant investigation as it can sometimes indicate declining ovarian reserve.

Investigation typically begins with a thorough history and may include:

The specific tests recommended will depend on your symptoms, age, and whether you're trying to conceive. Results help identify treatable causes and guide appropriate management.

Treatment depends on the underlying cause and your goals (symptom management, conception, or both):

• Lifestyle modifications: If weight, stress, or exercise are contributing factors, addressing these can sometimes restore regularity.
• Hormonal treatments: The oral contraceptive pill can regulate cycles for women not currently trying to conceive. Other hormonal therapies may address specific imbalances.
• Ovulation induction: For women with irregular cycles who are trying to conceive, medications can stimulate ovulation.
• Treatment of underlying conditions: Managing thyroid disorders, treating PCOS with appropriate medications, or addressing other identified causes.

For gynaecology care related to menstrual issues, a specialist can help determine the most appropriate approach for your individual situation.