Irregular Periods — Causes, Signs & When to See a Doctor
Mahawari ki bay-qaidagi — kya wajah hai aur kab doctor se milein
Quick Answer
Periods are irregular when cycle length is shorter than 21 days, longer than 35 days, varies by more than 7–9 days between months, or periods are skipped without pregnancy. Common causes include stress, weight change, PCOS, thyroid disease, breastfeeding, and perimenopause. See a doctor if cycles are persistently irregular, periods stop for 3+ months without pregnancy, bleeding is unusually heavy, or pattern changes suddenly.
What counts as "irregular"
A normal adult menstrual cycle lasts 21 to 35 days from the first day of one period to the first day of the next. You can read the full breakdown on the normal cycle length guide. Periods are considered irregular when:
- Cycle length is consistently below 21 days or above 35 days
- Cycles vary by more than 7–9 days month to month
- Periods are skipped without pregnancy
- Bleeding is much heavier than usual or lasts more than 7 days
- Spotting or bleeding occurs between periods
Common causes
Hormonal & metabolic conditions
- PCOS (Polycystic Ovary Syndrome) — common in Pakistani women; causes long or skipped cycles, often with acne, hirsutism, or weight gain. See PCOS symptoms guide.
- Thyroid disease — both hypo- and hyperthyroidism affect cycles. A TSH blood test is the usual screen.
- High prolactin — can stop or shorten periods; sometimes caused by medication or a benign pituitary growth.
- Perimenopause — natural transition typically starting in the 40s; cycles often shorten first, then lengthen and skip.
Lifestyle & environment
- Stress — academic, work, family. Cortisol disrupts the hormones that trigger ovulation.
- Weight loss or gain — particularly rapid changes, very low body fat, or eating disorders
- Intense exercise — high training load (marathon, competitive sport) can suppress ovulation
- Travel and sleep disruption — usually short-term
Reproductive & uterine
- Pregnancy — the most common cause of a missed period
- Breastfeeding — periods often pause or are irregular
- Hormonal contraception — pills, injections, IUDs all change bleeding patterns; this is expected, not a problem
- Uterine fibroids or polyps — can cause heavy or prolonged bleeding
When to see a doctor
See a gynaecologist or family physician if any of the following apply:
- You have not had a period in 3 months and pregnancy is ruled out
- Cycles are consistently shorter than 21 days or longer than 35 days
- Bleeding is very heavy (soaking a pad or tampon every 1–2 hours), or lasts more than 7 days
- You bleed between periods, after intercourse, or after menopause
- Periods become painful enough to disrupt daily activities
- Pattern changes suddenly from your usual
- You are trying to conceive and cycles are irregular
What investigations to expect
A doctor will typically take a history, examine, and may order:
- Pregnancy test (urine or blood β-hCG)
- Pelvic ultrasound to check the uterus and ovaries
- Blood tests: TSH (thyroid), prolactin, and sometimes LH/FSH and androgens
- Random or fasting glucose if PCOS is suspected
Frequently asked questions
What counts as an irregular period?
Periods are considered irregular when cycle length is consistently shorter than 21 days or longer than 35 days, when cycle length varies by more than 7–9 days from one month to the next, or when periods are skipped without pregnancy. Bleeding that is unusually heavy or prolonged also falls under irregular bleeding.
Can stress cause irregular periods?
Yes. Significant stress raises cortisol, which can disrupt the hormones that drive ovulation. Exam stress, shift work, bereavement, or major life changes commonly delay or skip a period. Stress-related changes usually resolve within 1–2 cycles after the stressor passes.
How does PCOS affect periods?
PCOS (Polycystic Ovary Syndrome) is one of the most common causes of irregular periods in women of reproductive age, including in Pakistan. It typically causes long cycles (more than 35 days), skipped periods, and sometimes very light or very heavy bleeding. Other signs include excess facial or body hair (hirsutism), acne, and difficulty losing weight.
Can thyroid problems cause irregular periods?
Yes. Both an underactive thyroid (hypothyroidism) and an overactive thyroid (hyperthyroidism) can change cycle length and bleeding heaviness. A simple TSH blood test screens for thyroid problems and is often part of the work-up for irregular periods.
When should I take a pregnancy test?
If you are sexually active and your period is more than 7–10 days late from your usual cycle length, take a home urine pregnancy test. If negative and the period still has not arrived after another week, repeat the test or see a doctor.
Are irregular periods always a problem?
No. Cycles are commonly irregular in the first 1–2 years after menarche, while breastfeeding, and during perimenopause. Occasional irregularity from stress, illness, or travel is also normal. Persistent irregularity, sudden changes, or symptoms like very heavy bleeding warrant evaluation.
What treatment is available for irregular periods?
Treatment depends on the cause. For PCOS, lifestyle changes (weight management, diet) and sometimes medication (combined oral contraceptives, metformin) are used. Thyroid disease is treated with thyroid medication. Stress and weight-related irregularity often resolves with the underlying issue. A gynaecologist will advise based on your situation.