Spotting Between Periods: Causes and When to See a Doctor

Spotting between periods is light vaginal bleeding that happens outside your normal period, often just a few drops or a smear. It is common and often has an ordinary explanation, such as ovulation or starting a new hormonal contraceptive. But it can also signal infection, a growth, or a pregnancy problem, so new or persistent spotting deserves a GP conversation.

What counts as spotting?

A normal menstrual cycle is typically 21 to 35 days long, with bleeding lasting up to 7 days, according to the American College of Obstetricians and Gynecologists (ACOG). Spotting is lighter than a period: it usually does not need a pad or tampon, or only needs a panty liner, and it happens at a time when you would not expect a period. Bleeding that soaks through protection, lasts for days or keeps returning is different from a one-off smear, and it is worth getting checked sooner.

Keeping a simple record helps a doctor a great deal. Note the dates, how heavy the bleeding was and whether it came with pain, discharge, fever or bleeding after sex. ACOG suggests tracking for several weeks before your appointment if you can, including the dates, length and type of bleeding.

Common causes of spotting between periods

Ovulation

A day or two of very light spotting around the middle of the cycle can happen when an egg is released. Ovulation spotting is usually brief and light, and it is one of the more common benign explanations, although it cannot be identified from the bleeding alone.

Hormonal contraception

Irregular bleeding is common during the first three months of starting hormonal contraception, including the combined pill, the progestogen-only pill, the patch, the implant, the injection or the intrauterine system, according to NHS guidance adapted by nidirect. Missing pills, a problem with a patch or ring, vomiting or diarrhoea while on the pill, and some medicines can also cause breakthrough bleeding. If bleeding lasts longer than three months, or a settled pattern changes, seek medical advice.

Hormone and ovulation problems

When ovulation does not happen, progesterone is not produced as usual and the womb lining can build up and shed unevenly, causing irregular or unexpected bleeding. This pattern is common in the first years after periods start, around perimenopause, and in conditions such as polycystic ovary syndrome (PCOS) and thyroid problems. Stress, significant weight change and over-exercising can also disturb ovulation and shift bleeding.

Fibroids and polyps

Fibroids are non-cancerous growths in the muscle of the womb, and polyps are small growths on the lining of the womb or cervix. Both can cause irregular or heavy bleeding, and polyps can cause spotting between periods or after menopause, as Mayo Clinic explains. Many fibroids cause no symptoms at all, so they are only found when bleeding is investigated.

Infection and cervical changes

Sexually transmitted infections such as chlamydia can cause bleeding between periods, and the NHS advises getting tested if you have recently had unprotected sex with a new partner. Harmless changes to the cervix, called cervical ectropion, can also cause spotting, particularly bleeding after sex. Bleeding after sex should always be checked by a GP or sexual health clinic, even though the cause is usually not serious.

Pregnancy

Light spotting can happen in early pregnancy, but any bleeding in pregnancy needs to be discussed with a clinician rather than assumed to be harmless. A missed period with unusual bleeding and tummy or pelvic pain needs urgent checking, as it could be a sign of an ectopic pregnancy, where a pregnancy develops outside the womb.

Less common but important causes

Less often, bleeding between periods can be a sign of cancer of the cervix or womb. That is uncommon, but it is why the NHS advises that any unusual bleeding should be checked, and why screening matters: if you are aged 25 to 64, keep up with cervical screening, and still see a GP about irregular bleeding even if your screening is up to date. Bleeding after menopause should always be checked promptly.

What happens at your appointment?

A doctor or nurse will ask about your symptoms, medical history, medicines and contraception, and may suggest tests such as a pregnancy test, blood tests, tests for sexually transmitted infections, or an examination of the vagina and cervix. Depending on your age and symptoms, you may be referred for a pelvic ultrasound scan, and sometimes for further tests such as hysteroscopy, where a thin scope is used to look inside the womb, or a biopsy of the womb lining. Treatment depends entirely on the cause, so there is no single remedy for spotting itself.

When to see a doctor

See a GP or visit a sexual health clinic if you are bleeding between periods or after sex, if spotting is new for you, keeps coming back, lasts longer than three months on a new contraceptive, or comes with pain, fever, unusual discharge or a change in your usual pattern. Seek medical help before your next routine appointment if bleeding soaks at least one pad or tampon an hour for more than two hours in a row, or if you have vaginal bleeding after menopause.

Ask for an urgent GP appointment or call NHS 111 if you have recently missed a period, have unusual vaginal bleeding and have pain anywhere in your tummy, including pelvic pain, as this could be a sign of an ectopic pregnancy. If you have heavy bleeding with chest pain, shortness of breath or feeling light-headed or dizzy, seek emergency medical care right away.

In an emergency call 911 (US), 999 (UK) or 112 (EU).

This article is for information only and cannot diagnose you. Only a clinician who can examine you and take your history can identify the cause of your bleeding.