A typical cycle is every 21 to 35 days. Gaps longer than 35 days, fewer than 8 periods a year, skipped months or spotting between periods are worth checking. In PCOD the egg often does not release, so periods become late, missed or heavy.
A period that arrives on a different date every month is the most common reason women first suspect PCOD. It is also easy to brush off, especially in the teen years. It helps to know what the numbers look like.
What a typical cycle looks like
Day 1 is the first day of bleeding. A typical cycle is every 21 to 35 days. Bleeding lasts 2 to 7 days, and a pad changes every 3 to 4 hours or less often.
Around day 14, an egg is released. In the second half of the cycle, progesterone prepares the womb lining. If there is no pregnancy, the lining sheds and the next period starts.
What counts as irregular
These are worth checking:
- cycles longer than 35 days
- fewer than 8 periods a year
- skipping months
- spotting between periods
So a period every 40 or 50 days is irregular, even though it does arrive. A tracker makes this easy to see. Write the first day of every period, and the pattern shows up in a few months.
Why PCOD changes the pattern
In PCOD the egg often does not release. Without ovulation there is no rise in progesterone, so periods become late, missed or heavy. High insulin and high androgens disturb the cycle further.
That is why irregular periods often travel with other signs, such as acne, extra dark hair or thinning at the parting. They share the same hormonal root. Whether it is called PCOD, PCOS or now PMOS, the new official name for PCOS, doctors read the same signal in your cycle.
Irregular periods that are not PCOD
Thyroid and prolactin problems can look like PCOD. That is why doctors always test them too. Stress hormones also affect insulin and ovulation, so a hard few months can shift your dates.
Teens are a special case. Irregular periods are common in the first 2 to 3 years after the first period. A doctor can check whether it is simply your body settling in, or something that needs care.
What a doctor may check
Depending on your story, you may be advised a pelvic ultrasound and blood tests such as LH, FSH, AMH, prolactin and TSH. If other signs suggest insulin resistance, sugar and insulin tests may be added.
Bring your period dates. A written record is more useful than an estimate, and it can save a repeat visit.
What helps
Lifestyle comes first: food, movement, sleep and managing stress. If you carry extra weight, losing 5 to 10% of your body weight can bring back regular ovulation and periods. Small habits you can keep beat big plans you drop. A 10-minute walk after meals is a good start.
Medicines are chosen for your goal. Hormonal pills or progestins can regulate cycles and lower androgens, and they also protect the womb lining. If a baby is the goal, ovulation medicines are often the first step. All of these are taken only on your doctor's advice, and that includes supplements such as inositol and vitamin D.
Why it is worth treating
Irregular periods are more than an inconvenience. If periods are missed for many months, the womb lining can keep thickening. Over the years this can cause heavy bleeding and, rarely, serious lining changes. A doctor can give a simple treatment to protect it.
Aim for a period at least every 3 months. If that is not happening, tell your doctor, because a gap that long is a reason to act and is not something to wait out.
When to see a doctor
See a doctor if your periods are more than 35 days apart, even if you feel well. Track your dates and bring them along.
See a doctor soon if you have had no period for 3 months and you are not pregnant. If you are a teenager, see a doctor if there is no period by age 15, or more than 3 years after breast growth began.
A doctor decides
This article is education, not a diagnosis. Only a doctor who has your history, tests and scan can say why your periods are irregular. Irregular periods are common in PCOD and they are manageable. It is not your fault.
When to get help urgently
Do not wait for an appointment if you have any of these. Get medical help the same day.
- severe lower tummy pain
- fainting
- very heavy bleeding
- chest pain or breathlessness
- a sudden deepening of the voice with rapid hair growth
Common questions
How many days apart should periods be?
Is it normal for periods to be irregular in the teen years?
Can irregular periods have a cause other than PCOD?
Do I need medicines to make my periods regular?
Not a diagnosis
This guide is for education. Only a doctor who has examined you and seen your tests can tell you what is going on. If you have symptoms that worry you, book a visit or message us on WhatsApp.