What is spotting and why does it happen?

Nothing in this article is or should be construed as medical advice; for any medical questions, consult your healthcare professional.  

It’s normal to feel a twinge of worry if you see a few spots of unexpected blood in your underwear or on a piece of toilet paper. While it’s always important to see your doctor anytime you experience bleeding outside the expected window of your period, know that you’re not alone. Up to one-third of women experience abnormal bleeding in their lifetime,¹ and spotting can occur for many different reasons. Let’s take a closer look.

What is spotting?

If you’ve ever experienced lighter bleeding between periods, chances are you’ve called it spotting. This type of bleeding is also known as abnormal uterine bleeding² or breakthrough bleeding. Some people also refer to the light bleeding at the beginning or end of a period as spotting.

What does spotting look like?

The term “spotting” is fitting because that’s what it looks like: spots of pink or red on your underwear, pad, toilet paper or in the toilet. Spotting is lighter than the bleeding you typically experience during a period. If you experience premenstrual syndrome (PMS) symptoms before your period, this can help you further differentiate spotting from the start of your period.

Remember: No two periods are identical. If you’re unsure about the timing of your cycle, tools like the Clearblue® Period & Cycle Tracker App can help you keep tabs on your cycle and predict when to expect your period.  

When does spotting occur?

Spotting can occur at any point during your cycle outside of your period. The timing of this spotting depends on why it’s happening; we dig into the details of each cause below. In general, you may experience spotting:

• During a transition in life: perimenopause, menopause^5,6
• In the middle of your cycle: ovulation bleeding
• One to two weeks after conception: implantation bleeding⁷
• In early pregnancy: Always see a doctor if you experience bleeding during pregnancy.⁸

Spotting can also occur at times not linked to a transition in your life, your menstrual cycle, conception or pregnancy, such as:

• When you start, stop or switch birth control⁹
• When you have sex¹⁰
• If you have endometriosis,⁵ ovarian cysts,⁵ uterine fibroids¹¹ or an STI¹²

If you suspect spotting is related to any of these factors, talk to your healthcare professional. 

What causes spotting?

Spotting can occur for several reasons, so it’s important to see your doctor if you experience it. They will help you narrow down the cause specific to your symptoms. In the meantime, here are some possible causes of spotting: 

Causes of spotting between periods

• Taking hormonal birth control: Spotting, sometimes called breakthrough bleeding, can occur when you start, stop or switch certain types of hormonal birth control.^2,9 According to The American College of Obstetricians and Gynecologists (ACOG), spotting on birth control is more common if you’re using low-dose birth control pills, implants and hormonal IUDs.⁹ You’re also more likely to experience spotting while on birth control if you smoke, don’t take your pills regularly and/or if you take your pills continuously to skip your period.⁹
• Having sex: According to a study published in 2022 in The Obstetrician & Gynaecologist, up to 9% of women experience bleeding after sex.¹³ Spotting after sex could be the result of vaginal dryness or cervix inflammation.¹⁰ If you experience bleeding after sex, talk to your healthcare provider.
• Ovulation bleeding : A small percentage of people experience spotting around the time they ovulate. Spotting during ovulation is sometimes caused by an egg bursting from the follicle in your ovaries, and can be accompanied by cramping or pelvic pain.¹⁴ Intense pain during ovulation can also be a sign of a medical condition, so if you think it could be something more serious, be sure to contact your healthcare professional.
• STIs: Sexually transmitted infections, such as chlamydia and gonorrhea, can be a cause of spotting between periods.¹² If you think you may have an STI, reach out to your healthcare provider. 

Causes of spotting during pregnancy

• Implantation bleeding : If a fertilized egg implants in the lining of your womb (resulting in pregnancy), you may notice some spotting around the time your period is due.⁷ Implantation bleeding lasts about one to two days, is light in color and may come with some light cramping.⁷ If you think you may be pregnant, take a pregnancy test and reach out to your doctor.
• Early pregnancy: According to ACOG, spotting occurs in 15–25 out of every 100 pregnancies, possibly because more blood vessels are developing, causing the cervix to bleed more easily.⁸ Spotting during early pregnancy can also occur after sex and pelvic exams.⁸
• Ectopic pregnancy: An ectopic pregnancy is serious and requires immediate medical attention. According to ACOG, sometimes the only symptom is vaginal bleeding. Other symptoms include pelvic, abdominal or shoulder pain.⁸

Reasons for spotting due to life transitions

• Perimenopause or menopause: During perimenopause, your period may change, becoming either lighter or heavier.⁶ However, spotting or bleeding that occurs outside your period, after sex or after menopause is not normal.⁶ If you notice it happening, contact your doctor.

Causes of spotting related to health issues

• Endometriosis : This is a common, often painful condition in which the tissue that lines the uterus grows outside the uterus.^5,16 Endometriosis has many symptoms, including spotting or bleeding between periods.^5,16
• Other possible causes: These can include ovarian cysts,⁵ uterine fibroids¹¹ and cancer.^2,5

If you experience spotting and have any concerns, reach out to your doctor healthcare professional.

 When should I be concerned about spotting?

Spotting can occur for many reasons; some are more serious than others. However, it’s important to see your healthcare professional to get to the root cause. Depending on the reason, you may need to seek medical treatment. See your doctor if:

• You’re bleeding anytime in your cycle other than during your period⁵
• You’ve bled after sex more than once⁵
• You’re pregnant or think you could be⁸
• You’re spotting and postmenopausal⁵

How to prepare to talk to your doctor about spotting

Before you visit your healthcare professional, it may be helpful to put together a detailed personal health history, as spotting can be caused by many different things.² Gathering information about your family health history is also wise.² Bring a list of all the medications you’re taking (including birth control).² And if you have time, try to track when your spotting occurs, noting what it looks like and how long it lasts, up until your appointment.¹

Is spotting normal?

Most spotting is usually harmless, and the result of normal processes/reactions your body is going through. But it’s also normal to be concerned anytime you’re bleeding when you weren’t expecting to be. Knowing when to check with a professional is important. If you believe your spotting could be cause for concern, contact your healthcare professional. 

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