This website has been developed and fully funded by Bayer plc for a UK audience only. Disclaimer and side effect reporting information can be found at the bottom of the page.

Two friends researching periods on phone and laptop

What are periods?

What are periods?

A period is when girls, women and others who menstruate bleed from their vagina as part of the menstrual cycle.

Female REPRODUCTIVE Organs

Click on each label for details.

Fallopian Tubes Uterus Fimbriae Ovaries Endometrium Cervix Vagina
Female resting on sofa during period

DURATION

The bleeding may last between 2 to 8 days, if your periods regularly last longer than 7 days it may be worthwhile booking an appointment with your doctor as you may be suffering from a condition called heavy menstrual bleeding.

BLOOD LOSS

Typically you will lose between 3 to 15 teaspoons of blood in each period but some women may bleed more than this, if you regularly lose more than 13 teaspoons of blood this could also be a sign of heavy menstrual bleeding.

Scale depicting typical and atypical blood loss in terms of teaspoons of period blood

3-13
teaspoons

Scale depicting typical and atypical blood loss in terms of teaspoons of period blood

14-15
teaspoons

Scale depicting typical and atypical blood loss in terms of teaspoons of period blood

15+
teaspoons

 

Typical blood loss

 

 

 

Maybe speak to your doctor

COLOUR

The first two days of a period are often the heaviest with the blood being red in colour but on lighter days you may find that the blood is pink, brown or black.

Blood droplets depicting various colours of period blood

RED

Beginning, end and/or heaviest days of your period, fresh blood.

Blood droplets depicting various colours of period blood

PINK

Mid cycle, light bleed, period blood mixed with cervical fluid.

Blood droplets depicting various colours of period blood

BROWN

Beginning or end of your period, old blood exposed to oxygen (oxidised), making it darker.

Blood droplets depicting various colours of period blood

BLACK

Beginning or end of your period, old blood exposed to oxygen (oxidised), making it darker.

If your blood or discharge is orange or grey it may indicate an infection. Consult your doctor if you do have any concerns about colour changes to your period blood.

Did you know?

It's important to remember that periods are totally natural, the more we talk and share our experiences the quicker we'll break down barriers for others.

Woman hiking in nature at one with her menstrual cycle

THE MENSTRUAL CYCLE, COMPLEX BUT BEAUTIFUL

Do you know your follicular phase from your luteal phase? What's happening inside my body? We'll try our best to keep it as simple as possible, learn all about the menstrual cycle here.

 

Learn more

PP-UN-WHC-GB-0041 September 2023

Disclaimer

The health information on this site has been reviewed and approved by Bayer by an appropriately qualified medical reviewer. It is intended as general information only. It is not intended to replace a consultation with a healthcare professional, to provide specific medical advice or replace the patient information leaflet provided with your medicine. Treatments discussed here should be initiated under medical supervision. For full information including side effects and eligibility for treatment, please consult your healthcare professional. Always speak to your doctor or nurse for personal medical advice.

 

Images on this site are stock images and for illustrative purposes only.

 

Reporting side effects

If you get any side effects whilst taking a medicine, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in the package leaflet. You can also report side effects directly via the yellow card scheme at www.mhra.gov.uk/yellowcard. By reporting side effects, you can help provide more information on the safety of medicines.