Vaginal bleeding between periods or after sex
Blood turns up on days when there should not be any: in the middle of the cycle, a week before a period is due, straight after sex or the following morning.
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Blood turns up on days when there should not be any: in the middle of the cycle, a week before a period is due, straight after sex or the following morning. The amount is usually small — pink or brown spotting, a few spots on underwear, a trace on the paper. That very scantiness is what misleads: it feels like there is nothing to report.
This page is about bleeding in a woman who is still having cycles. If a full year or more has passed without any period at all, the situation is different and so is the order of things to do: that is covered on the page about postmenopausal bleeding.
The rule to start with
Bleeding between periods, and above all bleeding after sex, is a reason to be examined, not a reason to wait and watch.
There is one specific reason for that rule. This is exactly how cervical cancer announces itself: scanty blood after sex, no pain, no sense of being ill at all. The tumour has a property that is rare in oncology — it gives a noticeable signal early, at a stage where treatment almost always works. Being seen after the very first episode is therefore not overcaution; it is precisely how the disease gets caught while it is curable.
You cannot tell a harmless cause from a dangerous one by looking — not from the amount of blood, not from its colour, not from how well you feel. A woman with cervical ectropion and a woman with early cervical cancer see exactly the same mark on their underwear. What separates them is not the symptom but the examination.
The second thing follows from the first: there is no need to wait for a repeat episode to be sure, because the repeat may be months away. A single episode of spotting and an obvious bleed lead to the same action — book an appointment with a gynaecologist.
When an appointment is not soon enough
Some situations call for help the same day, and a few of them for an ambulance.
- Bleeding when a period is late, when a pregnancy test is positive, or in a known pregnancy. This is not the cycle going astray; it is a reason to be seen that day, whatever the amount of blood.
- Signs of an ectopic pregnancy: pain on one side low in the abdomen, growing weakness, dizziness, fainting, pain in the shoulder or under the collarbone, sudden pallor. This is life-threatening — call an ambulance. The single European emergency number is 112.
- Blood soaks a pad within an hour and does so repeatedly; large clots come away; weakness, pallor or a racing heart appear.
- Bleeding together with a high temperature, pain low in the abdomen, or discharge that smells unpleasant.
- Bleeding after an injury or rough sex that does not stop on its own.
Otherwise there is no need to rush, but no reason to postpone it indefinitely either: a sensible marker is an appointment within the next few days.
Why the cervix is looked at first
Bleeding after sex is called contact bleeding: the outer part of the cervix is touched during every act of intercourse, and if its surface is altered it bleeds. The cervix can also be inspected directly, so the answer usually sits in the same place as the question.
Cervical cancer almost always grows out of a long-standing human papillomavirus infection, and it grows slowly: years of pre-cancerous change lie between the infection and the tumour, and those changes neither hurt nor bleed. That is why the disease is pursued in two ways — by screening before any symptom, and by investigation as soon as a symptom appears.
Screening means a cervical smear for cytology together with a test for human papillomavirus. It is offered regularly to women with no complaints; the starting age and the interval are set by the national programme of the country you live in.
A normal smear in the past does not cancel an examination now. Screening is designed for women without symptoms. Bleeding is a symptom, and it is investigated regardless of when the last smear was taken or what it showed: the sample comes from a limited area and can miss altered tissue, and years pass between two rounds of screening. Papillomavirus vaccination does not replace screening or an examination for bleeding either.
That said, in most women who come in with this kind of bleeding the cause turns out to be benign. That is good news, but it changes nothing about the order of events: the only way to learn which group you are in is to be examined.
What is found most often
- Cervical ectropion, also called cervical ectopy. The delicate lining that normally sits inside the cervical canal extends onto the outer surface of the cervix. That tissue is rich in fine blood vessels and bleeds readily on contact. It is neither pre-cancer nor a tumour; it is common in young women, on hormonal contraception and in pregnancy, and it often needs no treatment at all.
- Polyps of the cervix and of the womb cavity — soft outgrowths of the lining. Almost always benign, they bleed easily, are usually removed, and are always sent for analysis.
- Inflammation. Cervicitis and inflammation of the womb lining make the tissue fragile and prone to bleeding. Discharge that differs from usual, and sometimes a dull ache low in the abdomen, tend to come with it.
- Fibroids and endometrial polyps cause spotting in mid-cycle and make periods longer.
- Dryness and a thinned lining. Blood after sex appears through friction — this happens during breastfeeding, on certain medicines, and when there is not enough lubrication.
- Ovulation spotting. A few spots exactly in mid-cycle, repeating month after month. It is the last conclusion to be reached, once everything else has been ruled out.
Sexually transmitted infections
Chlamydia, gonorrhoea, trichomoniasis and mycoplasma infection can go for months without producing any sign other than spotting and blood after sex. That is one of the main reasons why swabs for infection are taken in a woman with contact bleeding even when she reports nothing else at all.
An infection left untreated travels upwards into the womb, the tubes and the ovaries. Pelvic inflammatory disease follows, and after it the risk of tubal infertility and of the very ectopic pregnancy described above goes up. So here it is not only accuracy of diagnosis that matters, but speed.
The testing is simple: a swab from the cervix or the vagina, sometimes a urine sample. Treatment is an antibiotic chosen for the particular organism, not one picked blind. A partner is treated at the same time even if nothing troubles him, otherwise the infection comes back. Abstinence or condoms are needed while the course lasts, and a check test follows a few weeks later.
Contraception, the coil and spotting
Hormonal contraception is one of the commonest causes of spotting, and in most cases it is entirely expected.
- The first two or three months on the combined pill, and the first months after switching brands, produce breakthrough bleeding.
- A pill missed or taken very late, or vomiting or diarrhoea soon after taking it, upsets hormone levels and brings on blood.
- Progestogen-only methods — the mini-pill, the implant, the injection — cause spotting more often, and it can carry on for months while the body settles.
- The hormonal coil usually spots through the first six months and then makes periods very light.
- The copper coil does the opposite: it makes periods heavier and longer and can add blood in between.
- Emergency contraception shifts the date of the next period and brings blood mid-cycle.
One caveat matters here. "It is the pill" and "it is the coil" are conclusions reached after an examination, not instead of one. Contraception protects against neither infection nor changes in the cervix, and having a coil fitted does not remove the need to look at the cervix. This applies above all to blood that starts after several untroubled years of use: there is no ground for blaming the method. Nor should contraception be stopped or swapped on your own initiative — that is discussed with a doctor.
How the cause is found
The work-up is usually short and fits into one or two visits.
- Examination. The cervix is inspected with a speculum and the womb and ovaries are felt. This step alone reveals a bleeding polyp, an ectropion, inflammation, or altered tissue on the cervix.
- A pregnancy test, for any late period and as a rule for any unplanned bleeding in a sexually active woman.
- Swabs for infection, plus a smear for cytology and a papillomavirus test if these are overdue or if the cervix looks abnormal.
- Ultrasound, usually transvaginal: the thickness and evenness of the womb lining are measured, fibroids and polyps are looked for, and the ovaries are checked.
- Colposcopy — the cervix viewed under magnification with staining solutions, with a targeted biopsy taken if needed.
- Hysteroscopy or a biopsy of the womb lining, when the blood appears to come from inside the womb.
- Blood tests: haemoglobin if the losses are heavy, and hormones or clotting studies where the picture calls for them.
There is no need to wait for a "clean" day before going: light spotting does not get in the way of an examination. What follows depends on the finding. A polyp is removed. An infection is treated with a course of antibiotics. An ectropion is usually just kept under review. Pre-cancerous changes of the cervix are treated with a small procedure on the cervix itself. Which medicines and what doses is decided by the doctor in the consulting room and cannot be settled from a distance.
Online consultation
An online appointment is a quick way to work out what to do next instead of losing a week thinking about it. The doctor will ask which day of the cycle the blood appeared on, whether it followed sex, what contraception you use and how long you have been on it unchanged, when your last smear was and what it showed, whether there is pain, fever or a change in discharge, and whether pregnancy is possible.
From that they can tell you which tests apply in your case, help you read a scan or a result you already have, explain what a colposcopy involves, and say plainly if your situation needs attention today rather than in a few days. What an online consultation cannot do is replace the examination: bleeding after sex always ends in someone looking at the cervix in person.
This material is for information only and does not replace medical advice.
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