You can tell the difference between bleeding and your period by its timing, length, amount and the symptoms that come with it: a normal period usually arrives every 21 to 35 days, lasts up to 7 days, and is heaviest in the first two days before tapering off, while blood that appears between periods, after sex or after menopause, or that is much heavier or longer than usual, is abnormal bleeding that needs a doctor's assessment. These signs alone cannot rule out a serious cause, so seek emergency help immediately if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever.
When is bleeding an emergency?
Before any comparison or home advice, seek emergency help immediately, without waiting to see whether the bleeding settles on its own, if it:
- soaks a pad or tampon in an hour or less;
- comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath;
- comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder;
- happens in a known or possible pregnancy, however light it seems;
- follows childbirth, miscarriage, abortion, surgery or an injury, or comes with a fever.
In any of these situations, do not drive yourself. Ask someone to take you to the nearest emergency department or call an ambulance (123 in Egypt). Some of these signs can point to major blood loss or an ectopic pregnancy, which cannot wait.
Bleeding vs period: seven differences
- Timing: a period comes at a roughly predictable time each month; abnormal bleeding can come at any time, between periods or after sex.
- Length: a period usually lasts 2 to 7 days; bleeding that goes on longer than 7 days deserves a check.
- Amount: during a normal period you do not usually need to change a pad every hour or two, wear two pads at once, or get up repeatedly at night to change.
- Pattern: a period starts light or moderate, peaks on day one or two, then eases and ends dark brown. Abnormal bleeding may start suddenly and heavily or stay at the same level for days.
- Clots: small clots can appear on heavy days; large clots that keep coming, bigger than a coin, are a sign of heavy bleeding.
- Symptoms: your usual period cramps feel like what you know every month; severe or sudden pain, dizziness or fever are not part of a normal period.
- Circumstances: any blood in a known or possible pregnancy, after childbirth, miscarriage or surgery, or after menopause is not treated as a period.
These differences help you understand what is happening, but they cannot be used to rule out a serious cause at home. Bleeding from an ectopic pregnancy, for example, can arrive close to the expected period and look much like one.
What does a normal period look like?
A menstrual cycle is counted from the first day of one period to the first day of the next. For most adult women it lasts 21 to 35 days, and it is normal for the start date to shift by a few days from month to month. In the first years after periods begin, cycles can be irregular and longer, and the same is true in the years leading up to menopause.
On heavy days the blood is usually bright red; at the start and end it tends to be dark red or brown. Some women notice light brown spotting a day or two before their period. Periods often come with lower-abdominal cramps, bloating, breast tenderness and mood changes, in a pattern each woman comes to recognise.
The key feature of a normal period is that it is predictable for you. Any clear change in your usual pattern, in timing, amount, length or pain, is worth discussing with a doctor.
Signs the blood is not a normal period
Bleeding between periods
Blood or spotting in mid-cycle or on unexpected days is called intermenstrual bleeding. It can occur lightly around ovulation in some women, or in the first months of hormonal contraception, but it can also come from polyps in the womb or cervix, infection or a hormonal imbalance. If it keeps happening, it needs to be assessed.
Bleeding after sex
Bleeding after sex is not a period. It can be linked to inflammation or polyps of the cervix, vaginal dryness, and sometimes changes in cervical cells, so it is worth seeing a gynaecologist even if it happened once, and especially if it happens again.
A period that is much heavier or longer than usual
Blood may come at the time of your period but be far heavier or longer than normal. This counts as heavy menstrual bleeding if you need to change a pad about every two hours, wear two pads at once, bleed for more than 7 days, keep passing large clots, or find it disrupts your work and sleep (if a pad or tampon soaks through in an hour or less, go to the emergency department immediately). Over time, heavy bleeding can cause anaemia, with constant tiredness, breathlessness on effort and pale skin.
Bleeding after menopause
Once 12 months in a row have passed since your last period, any blood afterwards, even a single episode of light spotting, is not a period and needs a doctor's visit as soon as possible. Most causes are minor, such as thinning of the vaginal lining, but changes in the womb lining must be ruled out.
Bleeding or period when you could be pregnant?
Some women have light pink or brown spotting around the time a period is due, known as implantation bleeding, which is much lighter than a usual period. But there is no way to tell it apart at home from an early miscarriage or an ectopic pregnancy, so any bleeding in a known or possible pregnancy is treated as needing emergency assessment.
If pregnancy is possible, a home pregnancy test helps, but a negative result in the first days does not always rule pregnancy out. If any emergency sign appears, go to the emergency department immediately, whatever the test shows.
Causes of abnormal bleeding
- Hormonal problems: such as ovulation disorders, polycystic ovary syndrome, thyroid disorders and raised prolactin.
- Changes in the womb: such as fibroids, polyps, adenomyosis and thickening of the womb lining.
- Contraception: hormonal pills, injections, implants and the coil, especially in the first months.
- Infections: of the cervix, womb or pelvis.
- Pregnancy complications: such as miscarriage or ectopic pregnancy.
- Blood-clotting disorders or the use of blood-thinning medicines.
- Less common causes: such as tumours of the cervix or womb lining, which is why repeated bleeding should not be ignored, especially after 45 or after menopause.
Severe stress, large changes in weight, strenuous exercise and chronic illness can also change the pattern of your periods.
When should you see a gynaecologist soon?
If you have none of the emergency signs, arrange to see a doctor as soon as you can if you notice:
- bleeding between periods or after sex;
- any bleeding after menopause;
- a period lasting more than 7 days, or needing to change a pad about every two hours (if a pad or tampon soaks through in an hour or less, go to the emergency department immediately);
- large clots that keep coming;
- cycles that are repeatedly shorter than 21 days or longer than 35 days;
- a sudden change in your usual pattern;
- tiredness that has built up over weeks, or breathlessness on effort that is slowly getting worse (if bleeding comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath, go to the emergency department immediately);
- ongoing bleeding on contraception after the first few months of using it.
What to do until you see the doctor
These steps are only suitable when none of the emergency signs above are present:
- Record the dates the bleeding starts and stops in a calendar or phone app.
- Note how many pads you use each day and how full they are, and whether there are clots and what colour the blood is.
- Take a pregnancy test if pregnancy is possible; a positive result with any bleeding needs emergency assessment.
- Rest, drink enough fluids and eat iron-rich foods.
- Some pain relievers from the non-steroidal anti-inflammatory class can ease cramps; use them as your doctor or pharmacist advises, and not in a possible pregnancy or alongside blood thinners without a doctor's advice.
- Do not stop prescribed medicines, such as contraception or blood thinners, or start hormonal medicines on your own, before talking to your doctor.
If any emergency sign appears while you wait, stop watching at home and go to the emergency department immediately.
How does a doctor find the cause?
The doctor will ask about your cycle, when the bleeding happens and how heavy it is, your contraception, the medicines you take and whether you could be pregnant, then examine you. Depending on the situation, they may arrange:
- a pregnancy test;
- a full blood count and iron stores to check for anaemia;
- thyroid and other hormone tests, and sometimes clotting tests;
- a pelvic ultrasound to look at the womb and ovaries;
- a cervical screening test;
- in some cases, a sample of the womb lining or a hysteroscopy, especially past a certain age or after menopause.
Treatment depends on the cause. It may include hormonal or non-hormonal medicines to reduce bleeding, iron supplements as your doctor prescribes, treatment of an infection, or procedures to remove polyps or fibroids when needed.
In short
A normal period is predictable in its timing, length and amount; blood that breaks that pattern is bleeding that deserves a check. Above all, know the emergency signs and act on them immediately, and do not rely on how the blood looks to reassure yourself.
Frequently Asked Questions
How do I know the difference between bleeding and my period if the blood comes at the wrong time?
Blood that comes outside your expected period, after sex, lasts more than 7 days or is much heavier than usual is abnormal bleeding that needs a gynaecologist's assessment, and its appearance alone cannot rule out a serious cause. Seek emergency help immediately if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever.
How do I know the difference between bleeding and my period if I might be pregnant?
There is no way to tell light implantation bleeding apart at home from an early miscarriage or an ectopic pregnancy, so any bleeding in a known or possible pregnancy needs emergency assessment, however light it seems. A home pregnancy test helps, but a negative result in the first days does not always rule pregnancy out. Seek emergency help immediately if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever.
When do I know the bleeding is not my period and I should go to the emergency room right away?
Go to the emergency department immediately, without waiting to see whether it settles, if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever. Do not drive yourself; ask someone to take you or call an ambulance (123 in Egypt).
Is brown spotting between periods bleeding or a period?
Brown spotting a day or two before a period or at its end can be part of the period for some women, and light spotting can happen around ovulation or in the first months of hormonal contraception. Spotting that keeps coming between periods, or appears after sex or after menopause, is abnormal bleeding that needs a doctor's visit as soon as possible. Seek emergency help immediately if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever.
Do clots in my period mean bleeding, or is it normal?
Small clots can appear on the heavy days of a normal period. Large clots that keep coming, bigger than a coin, needing to change a pad about every two hours, or bleeding for more than 7 days are signs of heavy menstrual bleeding that needs a doctor's visit and a check for anaemia. Seek emergency help immediately if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever.
Can birth control pills cause bleeding between periods?
Yes. Hormonal contraception, including the pill, can cause bleeding or spotting between periods, especially in the first months of use or after missed pills. Do not stop your contraception on your own, and see your doctor if the bleeding continues past the first months or gets heavier, because the cause may be something other than the pill, including pregnancy. Seek emergency help immediately if the bleeding soaks a pad or tampon in an hour or less; comes with dizziness, fainting, a racing heartbeat, pale or clammy skin, or shortness of breath; comes with severe or sudden pain in the abdomen or pelvis, or pain in the tip of the shoulder; happens in a known or possible pregnancy; follows childbirth, miscarriage, abortion, surgery or an injury; or comes with a fever.