The short answer: The most common reasons for a late period when you are not pregnant are stress, sudden weight loss or eating too little, being overweight, too much exercise, PCOS, thyroid problems, hormonal contraception, breastfeeding, perimenopause and illness. One late period is rarely serious and often sorts itself out next cycle. If you have had unprotected sex, take a pregnancy test first. See a doctor if you miss three periods in a row, or if a late period comes with other changes in your body.
First, is your period really late?
Before worrying, check your dates. Count from the first day of your last period, not the last day. The NHS says cycles from 21 to 35 days are common in adults, so a period on day 34 may simply be your normal. Most women's cycles also vary by a few days from month to month.
A good rule of thumb: if you are a week or more past the longest cycle you usually have, it is fair to call your period late. If your cycle has always been unpredictable, a single "late" period may not mean much. Our guide on how to calculate your next period date shows how to work out your usual range with real examples.
Teenagers in their first few years of periods often have irregular cycles, and that is expected while the body settles into a pattern.
Rule out pregnancy
If you have had sex without contraception, or contraception may have failed, pregnancy is the first thing to check, even if you feel sure it is something else.
- Most home pregnancy tests work from the first day of a missed period.
- If you do not know when your period was due, test at least 21 days after the last time you had unprotected sex.
- A positive result is almost certainly correct. A negative result is less reliable, so if your period still has not come, test again a few days later.
- If a second test is negative and there is still no period, see a doctor.
Tests are sold at any chemist in India. You can use urine from any time of day; just follow the instructions on the packet. If the signs are confusing you, read discharge before your period or early pregnancy.
10 common reasons your period is late
1. Stress
Stress is one of the most common reasons for a late period. Your cycle is controlled by a part of the brain called the hypothalamus, which also responds to stress. When you are under pressure, it can delay ovulation, the release of an egg, and so your period comes later. Board exams, job interviews, a move to a new city, wedding preparations, money worries or caring for a sick parent can all do this. Usually your cycle settles once the pressure eases.
If stress or low mood is affecting your sleep, eating or daily life, talk to your doctor. You can also call Tele-MANAS, the government's free mental health helpline, on 14416.
2. Sudden weight loss or eating too little
Your body needs enough energy to run a menstrual cycle. Crash diets, skipping meals, long fasts or losing a lot of weight quickly can make it pause periods to save energy. This can happen at any weight. If you are worried about how much you are eating, or food is causing you distress, please speak to a doctor, as this needs proper support.
3. Being overweight
Carrying extra weight can upset the balance of hormones that trigger ovulation, leading to late or irregular periods. Losing even a modest amount of weight, through regular meals and daily activity, often helps cycles become more regular. Your doctor can check whether PCOS or a thyroid problem is part of the picture.
4. Too much exercise
A sudden jump in training, such as preparing for a marathon, sports trials or police or army fitness tests, can delay or stop periods. This is more likely when you are not eating enough to fuel the extra activity. Easing back a little and eating well usually brings periods back.
5. PCOS
Polycystic ovary syndrome is a common hormone condition and a leading cause of irregular, late or missed periods. The NHS now calls it polyendocrine metabolic ovarian syndrome, or PMOS, though most doctors in India still say PCOS or PCOD. Other signs include acne or oily skin, extra hair on the face or body, hair thinning on the scalp, weight gain, dark velvety skin patches on the neck or armpits, and difficulty getting pregnant. It is diagnosed with blood tests and sometimes an ultrasound. Read more in PCOS explained.
6. Thyroid problems
The thyroid is a small gland in your neck that controls how your body uses energy. Both an underactive thyroid (hypothyroidism) and an overactive thyroid (hyperthyroidism) can change your cycle. An underactive thyroid may also cause tiredness, weight gain, feeling cold and dry skin. An overactive one may cause weight loss, a fast heartbeat, anxiety and feeling hot. A simple blood test can check your thyroid levels, and treatment usually helps periods return to normal.
7. Hormonal contraception
The combined pill, the progestogen-only pill, the contraceptive injection and the hormonal coil (intrauterine system, or IUS) can make periods lighter, irregular, or stop altogether. This is usually not harmful. After you stop hormonal contraception, it can take a few months for your natural cycle to return. Taking the emergency contraceptive pill can also make your next period come earlier or later than expected. If your next period is late after taking it, do a pregnancy test.
8. Breastfeeding
Breastfeeding keeps levels of a hormone called prolactin high, which can hold off ovulation. Many women who are breastfeeding have no periods for months. You can still get pregnant before your first period returns, because ovulation happens before that first bleed. Our guide to your first period after pregnancy explains what to expect.
9. Perimenopause
Perimenopause is the time leading up to menopause, usually between 45 and 55. Periods may become closer together, further apart, heavier, lighter, or skip months entirely before they stop. Hot flushes, night sweats, poor sleep and mood changes are common too. Some women notice changes from their early 40s. A doctor can talk you through treatment options such as hormone replacement therapy (HRT).
10. Illness, other health conditions and medicines
A bad viral fever, dengue, typhoid, COVID or any illness that knocks you flat can delay ovulation that month. Long-term conditions such as diabetes and heart disease can also affect periods. Some long-term medicines can change your cycle too, so mention everything you take to your doctor. Never stop a prescribed medicine on your own; ask the doctor who prescribed it.
Late period causes at a glance
| Cause | Other clues | What usually helps |
|---|---|---|
| Stress | Recent exams, work pressure, family events, poor sleep | Rest, routine, support; the cycle often settles |
| Eating too little or sudden weight loss | Recent dieting, fasting, skipped meals | Regular, balanced meals; medical support if needed |
| Being overweight | Gradual weight gain, sometimes with PCOS signs | Gradual weight loss, regular activity, a check-up |
| Too much exercise | New intense training, low energy | Easing training, eating enough |
| PCOS | Acne, extra facial hair, weight gain, long gaps between periods | Diagnosis and treatment from a doctor |
| Thyroid problems | Tiredness, weight change, feeling cold or hot | Blood test and treatment |
| Hormonal contraception | Started, changed or stopped a method, or took the emergency pill | Usually nothing; ask your doctor if unsure |
| Breastfeeding | Baby is breastfeeding often | Usually nothing; periods return later |
| Perimenopause | Age 40s or 50s, hot flushes, sleep changes | A doctor can discuss options |
| Illness or medicines | Recent fever or infection, new medicine | Recovery; ask your doctor about medicines |
See a doctor if
- You have missed three periods in a row
- Your periods have become irregular when they used to be regular
- A late period comes with weight gain or loss, tiredness, new facial hair, or very dry or oily skin
- You have had two negative pregnancy tests and your period still has not come
- You have not started your periods by 15
- Your periods are irregular and you are trying to get pregnant
- You bleed between periods or after sex
Get urgent help if
Call 112 or 108, or go to the nearest hospital emergency department, if your period is late and you have sudden, severe pain low in your tummy, especially on one side, pain in the tip of your shoulder, heavy bleeding, or you feel very dizzy or faint. These can be signs of an ectopic pregnancy, which needs emergency care, even if you have not done a test.
What your doctor will do
Your doctor or gynaecologist will ask about your cycle, any chance of pregnancy, your weight, diet, exercise, stress, medicines and other symptoms. Bring your period dates, written down or in an app, as this saves a lot of time.
They may suggest a pregnancy test, blood tests to check hormone levels, thyroid function and blood sugar, and sometimes a pelvic ultrasound to look at the womb and ovaries. Depending on what they find, they may refer you to a gynaecologist or an endocrinologist, a hormone specialist.
Treatment depends on the cause. Your doctor may suggest the combined pill to regulate periods in PCOS, thyroid medicine, HRT in perimenopause, or practical help with stress and weight. Often, once the cause is treated, periods become regular again.
What helps while you wait
- Track your dates. Write down the first day of every period so you and your doctor can see the pattern.
- Eat regular meals. Include dal, eggs, paneer or other protein, whole grains like ragi or millets, vegetables and fruit. Avoid crash diets and long gaps without food.
- Look after your sleep. Aim for a regular bedtime, especially during exams or busy work weeks.
- Move, but do not overdo it. A daily walk or yoga is helpful; sudden extreme training is not.
- Be ready for when it arrives. A late period can still show up without warning, sometimes heavier than usual. Wearing a period panty on the days you are expecting it, or keeping a panty liner in your bag, saves you from surprises at school, college or work.
Myths about bringing on a late period
"Papaya, jaggery, ajwain or sesame will bring my period on." These are common home remedies in Indian families, but there is no good evidence that any food reliably starts a period. Eating them in normal amounts as part of your diet is fine; just do not rely on them, and do not delay a pregnancy test or doctor's visit because of them.
"A late period always means something is wrong." Most one-off late periods have a simple cause, such as stress or illness, and settle by the next cycle.
"If the test is negative, I definitely am not pregnant." A test taken too early can be negative. Repeat it after a few days if your period still has not come.
Frequently asked questions
How late can a period be before I should worry? One late period is usually nothing serious. If it is more than a week late and you have had sex, take a pregnancy test. If you have missed three periods in a row, see a doctor.
Can stress alone delay my period? Yes. Stress is one of the most common reasons. If stress keeps delaying your periods, talk to a doctor.
Can a period be 10 days late and not pregnant? Yes. Stress, illness, weight change, PCOS, thyroid problems and contraception can all delay a period by 10 days or more. Take a pregnancy test to be sure, and repeat it if your period still does not come.
Can PCOS cause a missed period with a negative test? Yes. PCOS commonly causes long gaps between periods. A doctor can confirm it with blood tests and sometimes an ultrasound.
Can travelling delay my period? It can. Long journeys, time zone changes, disrupted sleep and the stress of travel can shift your cycle for a month.
Will my late period be heavier when it comes? Sometimes. A period that comes after a long gap can feel heavier than usual. If you soak through protection every hour or two, read heavy periods: how much bleeding is too much.
Is it normal for a teenager's period to be late? Yes, especially in the first few years. Cycles take time to become regular. See a doctor if periods stop for more than three months.
Related reading
- Irregular Periods: Causes, Tests and What Helps
- PCOS Explained: Symptoms, Diagnosis and Treatment
- How to Calculate Your Next Period Date (With Examples)
- Perimenopause: Symptoms, Period Changes and What Helps
This article is for general information and doesn't replace advice from your doctor.
Sources: NHS: Missed or late periods, NHS: Irregular periods, NHS: Polyendocrine metabolic ovarian syndrome (PMOS), NHS: Doing a pregnancy test, ACOG: Your First Period