Is bleeding between periods serious?

Usually it's due to a benign cause, but because some causes need attention, new or persistent bleeding should be reviewed.

What might the doctor check?

Typically a history and examination, that your cervical screening is current, and often an ultrasound, with further tests if needed.

Bleeding Between Periods: Causes

Bleeding between periods: possible causes

Bleeding between periods (intermenstrual bleeding) or after sex (postcoital bleeding) can have many causes, from hormonal changes to polyps or infection.

Most causes are not serious, but because some do need attention, it's worth getting new or persistent bleeding checked.

Key points

Bleeding between periods has many possible causes.
Most causes are not serious, but some need checking.
New or persistent bleeding between periods or after sex should be reviewed.
A review helps rule out treatable causes.

Last reviewed 27 June 2026

New or persistent bleeding between periods, or bleeding after sex, should always be reviewed by a clinician.

Possible causes

A range of things can cause bleeding between periods.

Hormonal changes or contraception effects
Endometrial or cervical polyps
Infection
Cervical changes
Less commonly, other conditions

Diagnosis: what to expect

A specialist may examine you, check that cervical screening is up to date, and arrange an ultrasound. Further assessment such as hysteroscopy may be discussed depending on findings.

When to see a specialist

New or persistent bleeding between periods, or bleeding after sex, is worth reviewing so any treatable cause can be identified.

Frequently asked questions

Sources & further reading

This page is structured around information from reputable Australian health bodies:

More plain-language reading from Dr Sivadas.

Menstrual & BleedingEndometrial polyps Cervical & Vaginal HealthCervical screening ContraceptionPill & hormonal options Menstrual & BleedingHeavy periods

Written & medically reviewed by

Dr Priya Sivadas

FRANZCOG, CREI, MMed · Fertility and Gynaecology Specialist

Last reviewed: 27 June 2026

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