The short answer: A healthy period usually comes every 21 to 35 days, lasts 2 to 7 days and loses about 20 to 90 ml of blood in total, roughly 1 to 5 tablespoons. The blood is red on heavy days and pink or brown on lighter ones, and small clots on heavy days are common. Mild cramps, tiredness and mood changes are normal. Soaking a pad every 1 to 2 hours, bleeding for more than 7 days, or pain that stops you living normally is not, and needs a doctor.
What counts as a healthy period?
There is no single perfect period. What is normal for you may look quite different from what is normal for your sister, your friend or your mum. Doctors look at a range rather than a fixed number, and at whether your own pattern stays fairly steady from month to month.
A healthy period has five things going for it. It comes at fairly predictable intervals. It lasts a reasonable number of days. The amount of blood is manageable with ordinary products. The colour and texture change gently from start to finish. And any symptoms are uncomfortable rather than disabling.
Your period is also a useful window on your general health. When a period changes a lot, it is often your body's way of telling you that something else needs attention, from stress or weight change to thyroid problems or PCOS.
Cycle length and period length: the normal range
How often should your period come?
Your cycle is counted from the first day of one period to the first day of the next. The NHS says it is around 28 days for most women, but anywhere from 21 to 35 days is common. A 26-day cycle one month and a 30-day cycle the next is still a regular pattern.
Teenagers have more leeway. ACOG, the American College of Obstetricians and Gynecologists, says cycles of 21 to 45 days are normal in the first years, and it can take 6 years or more after the first period for cycles to settle. A 15-year-old with a 40-day cycle is usually fine. A woman of 30 whose cycle suddenly stretches to 40 days should mention it to a doctor. If you want to work out when your next period is due, our guide on how to calculate your next period date has worked examples.
How many days should bleeding last?
The NHS says a period can last 2 to 7 days, and usually lasts about 5. A light day of brown spotting at the very start or end is part of the same period. Short periods are often perfectly normal, and we cover them in 1 or 2 day periods. Bleeding for more than 7 days is worth checking, and our guide on periods lasting longer than usual explains why.
How much blood do you really lose?
It feels like a lot more, but the NHS says you lose about 20 to 90 ml of blood over a whole period. That is about 1 to 5 tablespoons, or less than half a small steel katori. Most of it comes out in the first two or three days.
The reason it looks like more is that period flow is not just blood. It includes the womb lining, mucus and vaginal fluid, and it spreads out on a pad or fabric. A single drop can make a stain the size of a coin.
Very few people measure their blood loss, so doctors judge it from practical signs instead: how often you change, whether you leak, whether you pass large clots, and whether you feel tired or breathless. That is why keeping a simple note of your flow is far more useful than guessing.
Light, medium or heavy: how to tell your flow
Most people describe their flow as light, medium or heavy without being sure what those words mean. Here is a practical guide based on what you see when you change a pad. ACOG advises changing a pad at least every 4 to 8 hours, or whenever it feels full or wet, so that is the yardstick used here. Treat it as a rough guide, not a medical test.
| Flow | What a regular pad looks like | How often you change | What it usually means |
|---|---|---|---|
| Spotting | A few drops or a small brown or pink stain | A liner is often enough | Start or end of a period, or bleeding between periods |
| Light | Only partly marked after several hours | You change for comfort, not because it is full | Normal on first and last days |
| Medium | Comfortably full by the time you change | Within the usual 4 to 8 hours | Typical for the main days of a period |
| Heavy but normal | Full well before you expected | Every 3 to 4 hours on day 1 or 2 | Common on your heaviest day |
| Too heavy | Soaked through, leaking onto clothes or bedding | Every 1 to 2 hours, or two products at once | Heavy periods: see a doctor |
Most periods move through these stages: a light start, one to three medium or heavier days, then a light finish. That gentle rise and fall is a sign of a healthy pattern. If your flow now looks different from the way it used to, compare it with your notes from earlier months.
If your flow sits in the bottom row, our guide to heavy periods explains the causes and how to track it. If your periods have recently become much lighter, see why a period can suddenly get lighter.
Normal colours, clots and smell
The NHS says period blood is red when your flow is heaviest, and may be pink or brown on lighter days. Dark red, brown and even nearly black are usually just older blood. Our period blood colour chart goes through every shade, including the few that need a check.
Small clots on heavy days are common. Clots about the size of a ₹10 coin or larger, or lots of them every period, are one of the NHS signs of heavy bleeding. See blood clots in your period for the full guide.
A mild metallic smell is normal. A strong fishy or rotten smell is not, and our guide on why period blood smells explains what each smell can mean.
Normal symptoms and ones that are not
Most people feel something around their period. The question is whether it is a nuisance or whether it is taking over your life.
Usually normal
- Cramping in the lower tummy, back or thighs, mainly on the first one or two days.
- Bloating, tender breasts and mild headaches in the days before or at the start.
- Feeling tired, low or irritable before your period, which eases once bleeding starts.
- Loose stools or a change in bowel habits on day one.
- Some acne flare-ups around the same time each cycle.
For cramps, a hot water bottle, gentle movement such as a short walk or stretching, and over-the-counter painkillers like paracetamol or ibuprofen usually help. Check the packet or ask a pharmacist which suits you. Our guides to period pain and PMS go into more detail.
Not something to put up with
- Pain so bad you miss school, college or work, or painkillers don't touch it. The NHS says to see your GP if pain affects your daily life.
- Pain during sex, or when you pee or poo during your period.
- Mood changes so severe they affect your relationships or make you feel hopeless.
- Feeling tired, dizzy or breathless every period, which can be a sign of anaemia from heavy bleeding.
- Bleeding between periods or after sex.
Bleeding between periods has many possible causes, some harmless. Our guides to ovulation spotting and spotting before your period explain the most common patterns.
If low mood around your period ever makes you feel unsafe, call Tele-MANAS, the government's free mental health helpline, on 14416.
How your period changes through your life
A healthy period does not stay the same from 12 to 50. It is normal for your pattern to shift at different stages.
- The first few years. Periods usually start around 12, though some girls start earlier or later. Early cycles are often irregular and can vary a lot in flow. ACOG advises seeing a doctor if periods haven't started by 15. Our guide to the age of the first period and signs it is coming helps parents and teens know what to expect.
- Your 20s. For many women, cycles are at their most regular during these years.
- After pregnancy and breastfeeding. Periods can take months to return, and the first few may be heavier, lighter or more irregular than before.
- Your 30s and 40s. Flow may get heavier, and conditions like fibroids become more common. See how periods change in your 30s and 40s.
- Perimenopause. In the years before periods stop, cycles may get shorter, longer, heavier or skip months. Our perimenopause guide covers what is expected and what to check.
Hormonal contraception changes the picture too. The pill, the hormonal coil and the injection can make periods lighter, shorter, irregular or stop them altogether, which is usually expected rather than a problem.
Your period health checklist
Use this as a quick monthly check. If you tick the left column, your period is in the healthy range. If anything lands in the right column more than once, note it down and book a check-up.
| What to check | Healthy range | Get it checked |
|---|---|---|
| Cycle length | 21 to 35 days in adults, 21 to 45 days in teens | Shorter than 21 days, or regularly longer than the range |
| Days of bleeding | 2 to 7 days | More than 7 days |
| Flow | Pad lasts several hours, even on heavy days | Soaking a pad every 1 to 2 hours, doubling up, leaking at night |
| Clots | None, or a few small ones on heavy days | About the size of a ₹10 coin or larger |
| Colour | Red, dark red, pink or brown | Grey, or any colour with a bad smell |
| Pain | Eases with warmth, rest or a painkiller | Stops you going to school or work |
| Between periods | Clear or white discharge, occasional mid-cycle spotting | Repeated bleeding between periods or after sex |
| Energy | A little tired, back to normal soon after | Often tired or short of breath |
How to keep track
For two or three cycles, write down the start and end date, how many products you used each day, any clots, your pain level and how you felt. A period app or your phone's notes are enough. When you see a doctor, this record saves time and makes the conversation far more useful.
Staying comfortable whatever your flow
Your flow changes from day to day, so it helps to have products that keep up. Pads and liners work well, and many people switch to a liner on spotting days at the start or end.
Fabpad period panties have one absorbency that works for every flow, from light to heavy, so you don't need different products for different days. Each one holds about 5 to 6 pads' worth and is worn on its own, for up to 8 hours depending on flow, including overnight. Rinse it in cold water until the water runs clear, wash gently and dry it fully in the sun.
Whichever product you use, notice how quickly it fills. That is one of the most useful clues you have about whether your flow is in the healthy range.
See a doctor or get urgent help
See a doctor if
- You need to change a pad every 1 to 2 hours, use two products at once, or bleed through to clothes or bedding.
- Your period lasts more than 7 days.
- Your cycles are regularly shorter than 21 days, or longer than 35 days as an adult or 45 days as a teen.
- Your periods stop and you are not pregnant.
- You bleed between periods or after sex, or at all after menopause.
- Period pain affects your daily life.
- You often feel tired, dizzy or short of breath.
- Your pattern has clearly changed and stayed that way for a few months.
- You are 15 and your periods have not started.
A gynaecologist may ask about your periods, examine you, and suggest tests such as a blood test for anaemia or thyroid, a pregnancy test or an ultrasound scan.
Get urgent help if
Call 112 or 108, or go to the nearest hospital emergency department, if you are soaking through a pad every hour for several hours, feel light-headed, dizzy or faint, have a racing heartbeat, or have sudden severe tummy pain. Bleeding with severe pain when you could be pregnant also needs emergency care.
Frequently asked questions
How many pads a day is normal during a period? There is no fixed number. On medium days most people change every 4 to 8 hours. Needing a fresh pad every 1 to 2 hours, or doubling up, suggests heavy bleeding.
Is a 3-day period healthy? Yes. The NHS says 2 to 7 days is normal. A short period that is steady for you is not a concern.
Is it normal for my flow to change every month? Small changes are normal. Stress, illness, travel and weight change can all affect one cycle. A big change that lasts for several months is worth checking.
What is the normal cycle length for a teenager? ACOG says 21 to 45 days is normal, and it can take several years after the first period for cycles to become regular.
How do I know if I am losing too much blood? Signs include changing every 1 to 2 hours, leaking at night, passing clots the size of a ₹10 coin, bleeding for more than 7 days, and feeling tired or breathless.
Are clots a sign of an unhealthy period? Not usually. Small clots on heavy days are common. Large clots, or many of them every period, need a check.
Can a healthy period be painful? Mild to moderate cramps are common and normal. Pain that stops you doing everyday things is not, and a doctor can help.
Related reading
- Heavy Periods: How Much Bleeding Is Too Much?
- Irregular Periods: Causes, Tests and What Helps
- Why Does Period Blood Smell? Normal Odours and Warning Signs
- The Hormones Behind Your Menstrual Cycle, Phase by Phase
This article is for general information and doesn't replace advice from your doctor.
Sources: NHS: Periods, NHS: Heavy periods, NHS: Period problems, ACOG: Your First Period