Bleeding During Or After Sex: Causes And When To Get It Checked

Bleeding during or after sex can be frightening, especially when it happens without warning. Often, there is a straightforward explanation, like vaginal dryness, friction, sensitivity or a small amount of mid-cycle spotting. However, unusual vaginal bleeding that happens regularly, feels heavy, or starts after more than a year without periods needs closer investigation. Book a GP appointment or get it checked out at your local sexual health clinic, even if it isn’t causing you any discomfort.

Common Causes of Bleeding After or During Sex

Bleeding after sex, known as postcoital bleeding, affects between 0.7 and 9% of people who have periods*. It usually comes from the vagina or cervix, although blood from the womb can appear around the same time by coincidence. You may experience bleeding or spotting during or after sex, but the colour, quantity or appearance of the blood cannot reliably identify the cause. We discuss some of the most common causes of bleeding during or after sex below.

* Tarney, C, M & Han, J. (2014). Postcoital Bleeding: A Review on Etiology, Diagnosis, and Management.

Vaginal dryness and friction

When vaginal tissue is dry, penetration can cause tiny surface splits that spot or sting. There are many things that can cause vaginal dryness, including limited arousal, menopause, breastfeeding, childbirth, and even certain medications that impact your oestrogen levels. Sex that is deep, vigorous or continues despite feeling discomfort can add to the friction. This does not mean you have done anything wrong, but pain, bleeding or dryness are signs to take a break.

Cervical ectropion

Cervical ectropion is a common condition in which delicate glandular cells from inside the cervix spread to the outer cervical surface*. It is a harmless and non-cancerous condition⁺ but when these cells are touched during sex or an internal examination, they can bleed. Cervical ectropion is linked to pregnancy, younger age or the combined contraceptive pill, and treatment isn’t always needed if this is found to be the cause of your vaginal bleeding.

* NHS Cambridge University Hospitals NHS Foundation Trust. (no date). Cervical Ectropion.

⁺ Aggarwal, P & Ben Amore, A. (2023). Cervical Ectropion.

Ovulation-timing spotting

You may notice small pink, red, or brown discharge around the time of ovulation, when your ovaries release an egg, because hormone levels change. One study has shown that 4.8% of people experience midcycle or ovulation bleeding*. If you have sex at the same time as ovulation takes place, the bleeding may appear to be sex related, and if you had unprotected sex, there is a high chance you could become pregnant.

* Dasharathy, S, S et al. (2012). Menstrual Bleeding Patterns Among Regularly Menstruating Women.

Recent IUD insertion or hormonal contraception changes

If you recently had an intrauterine device (IUD), known as the copper coil, or a hormonal coil (intrauterine system (IUS)) fitted, or changed your hormonal contraception method, you may notice irregular bleeding during the first few months as your body adjusts to the hormonal changes. If you are concerned about the bleeding or it is heavy, persistent, or comes with worsening pelvic pain, fever or unusual discharge, contact your GP for advice.

Endometriosis

Although endometriosis is not one of the most common explanations for bleeding after sex, it can cause bleeding between periods and pain during or after sex. Other symptoms include painful periods, persistent pelvic pain or difficulty getting pregnant. However, these symptoms can have several causes, so a GP needs to investigate further to confirm the reason.

Pregnancy or breastfeeding

When you are pregnant, your cervix receives more blood, and it can become softer and more fragile, meaning it may bleed more easily after sex. However, bleeding during pregnancy should still be discussed with a midwife or GP.

Breastfeeding can also cause bleeding during or after sex because it can keep oestrogen levels low. This can make vaginal tissue drier and more fragile, making friction-related spotting more likely. It’s also possible that healing tears and scar tissue caused by childbirth can feel tender and may contribute to spotting or bleeding. Following your midwife's or GP's advice and attending a postnatal review can help. 

Causes Linked to Infection

Bleeding during or after sex, especially if it does not cause pain, may sometimes suggest the presence of a sexually transmitted infection. However, they can also cause unusual discharge, pain or urinary symptoms depending on the cause. The only way to know for sure whether an infection is causing your symptoms is to get tested. 

Cervicitis and STIs

Cervicitis is also known as inflammation of the cervix and is most commonly caused by sexually transmitted infections, like chlamydia and gonorrhoea, but can also be caused by genital herpes and non-infectious causes, like bacterial overgrowth*. Alongside bleeding during or after sex, you might notice unusual vaginal discharge, pain during sex or a burning sensation when going for a pee. 

* Carlson, K et al. (2026). Cervicitis. 

Pelvic inflammatory disease (PID)

Bleeding during or after sex can be a warning sign of pelvic inflammatory disease (PID), an infection of the female reproductive organs, such as the womb, fallopian tubes or ovaries, that’s caused by bacteria moving upwards from the vagina or cervix. Symptoms can include pelvic pain, pain during sex, unusual discharge, bleeding between periods or after sex, and fever. If left untreated, PID can cause scar tissue and, in the most severe cases, infertility. 

Bleeding After Sex During Perimenopause or Menopause

During perimenopause and menopause, there are several changes occurring in your body that can cause bleeding during or after sex. For example, fluctuating hormones during perimenopause can make your periods less predictable, while falling oestrogen levels can make vaginal tissue drier and more delicate. Sex may then cause light bleeding, and while irregular menstrual cycles are common at this time, they shouldn’t always be used as a blanket explanation for new bleeding during or after sex. 

After menopause, genitourinary syndrome of menopause, also known as vaginal atrophy, is one of the most common causes of postmenopausal bleeding*. Low oestrogen levels make the vaginal lining thinner, less elastic and less naturally lubricated, resulting in dryness, burning, painful sex, and spotting. 

Any vaginal bleeding that occurs after you have not had a period for 12 months should be checked by a GP, including one-off spotting, pink or brown discharge, and bleeding while using hormone replacement therapy (HRT). HRT can cause bleeding in some cases, but it is important that you check with a clinician that this is expected with the type you are using. 

* NHS. (2023). Postmenopausal bleeding.

Less Common but Serious Causes

Sometimes bleeding during or after sex can be caused by less common, but serious causes, which will need to be investigated by your GP so that you can access the most suitable treatment. These include polyps, fibroids and certain cancers. However, not every case of unexplained vaginal bleeding is caused by cancer – just 9% of postmenopausal women seeing a doctor because of vaginal bleeding received a cancer diagnosis*. Here, we explain the less common but serious causes of bleeding during or after sex, not to cause worry, but to emphasise why further investigation really matters. 

* National Cancer Institute. (2018). Study Provides Closer Look at Postmenopausal Bleeding and Endometrial Cancer.  

Cervical and uterine polyps

Polyps are small tissue growths that occur on the cervix or within the womb. Most are benign, but a cervical polyp can bleed during sex while a uterine polyp may cause bleeding between periods. Depending on its appearance, symptoms and your age, a clinician may decide to monitor it or remove it so that it can be sent for testing. 

Fibroids

Fibroids are non-cancerous growths in or around the womb that can cause heavy or prolonged periods, pelvic pressure and bleeding between periods. However, they can also cause light to moderate bleeding during or after sex, especially if they are large or located near the cervix. 

Cervical or uterine cancer

Bleeding after sex can be a symptom of cervical cancer, and postmenopausal bleeding can be a symptom of womb cancer. Neither is a common cause, but postcoital bleeding should be investigated further to identify the cause. Risk factors include age, smoking, human papillomavirus (HPV) exposure, immune status, body weight and cervical screening history. 

One study has shown that in a UK cohort of women urgently referred for postcoital bleeding, 1.16% were diagnosed with cervical cancer. No cancer was found in women who were up to date with cervical screening, compared with 6.25% among those whose screening was overdue or were outside of the screening age*.

* Jasper, B et al. (2022). The incidence of cervical cancer in women with postcoital bleeding and abnormal appearance of the cervix referred through the 2‐week wait pathway in the United Kingdom: A retrospective cohort study.

How to Minimise Bleeding During or After Sex

There are several things you can do to help reduce friction-related bleeding to make your sexual experiences more comfortable and pleasurable. They include:

• Use lubricant – Use a water- or silicone-based product to help reduce friction during sex. Check compatibility with condoms and sex toys first.

• Take your time – Go slowly to help build your arousal by engaging in foreplay with your partner, add lubricant before discomfort happens and stop if penetration hurts.

• Try shallower positions – Sexual positions that allow you to control depth and pace may reduce contact with a tender cervix or healing tissue, reducing the chance of bleeding or spotting.

• Use a vaginal moisturiser – Vaginal moisturisers are applied regularly to help tackle ongoing dryness, rather than during sex like lubricant.

• Ask about vaginal oestrogen – If menopause is contributing to vaginal dryness, speak to your GP about whether vaginal oestrogen is suitable for you.

• Get an STI test – If you have had unprotected sex, or sex with a new partner or a partner who has symptoms, arrange an STI test.

• Attend cervical screening appointments – Go to your cervical screening appointments so that your clinician can check for potentially serious issues like cervical cancer that can cause unexplained bleeding. 

When To See A Doctor And What To Expect

If you get any unexplained bleeding during or after sex, it is advisable to book a GP or sexual health clinic appointment to diagnose the cause and rule out any potentially serious problems. This is potentially important if the bleeding repeats, is getting heavier, occurs between periods, comes with pain or unusual discharge, or happens after menopause.

At your appointment, the clinician may ask:

• When the bleeding began and how much there was

• Whether it happens every time

• When you last had a period

• Whether pregnancy is possible

• About contraception or HRT

• Whether you have pain, discharge or urinary symptoms

• About any medications you take or medical conditions you have

• About possible STI exposure

• When you last attended cervical screening

If you are asked about the kind of sex you have, don’t worry this isn’t intended to judge you, but to help guide your clinician's response and diagnosis pathway.

A pelvic examination, usually including a speculum examination to see the vagina and cervix, is a standard first step for postcoital, intermenstrual or postmenopausal bleeding. You may also be offered:

• a pregnancy test

• swabs or urine tests for STIs

• blood tests

• cervical screening if it is due, although this does not replace investigation of symptoms

• referral for an ultrasound, colposcopy or laparoscopy if needed

If you are worried or anxious about further testing, you can ask for a female clinician, request a chaperone, or discuss using a smaller speculum. You can also ask the clinician to stop at any time if you are feeling uncomfortable or anxious. 

FAQs

Can bleeding after sex mean I'm pregnant?

Yes. Bleeding after sex can suggest pregnancy because it can make the cervix more sensitive, but spotting can also be caused by many factors that are not pregnancy related. If pregnancy is possible, take a pregnancy test to find out if this may be the cause of your bleeding.

Can sex trigger periods in perimenopause?

It depends.  Sex can sometimes cause a period to start early or cause bleeding that mimics a period during perimenopause. Perimenopause can also cause irregular bleeding, while vaginal dryness may cause spotting. Because these explanations overlap, new, repeated or heavy bleeding after sex should be investigated by a clinician.

What if I’ve got postcoital bleeding after menopause?

If you get any bleeding after sex, even if it only happened once, was painful or only involved a small amount, make an appointment with your GP for further investigations. They may want to carry out further tests depending on your medical history.

Does deep sex cause bleeding?

Yes. Deep penetration can irritate a sensitive cervix, cervical ectropion or vaginal tissue, especially when there is dryness. If deep penetration is causing bleeding during or after sex, try shallower positions, slower penetration and lubricant, and speak to your GP if the bleeding is unexplained, recurrent, heavy or painful.