References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Many STIs cause no symptoms in women, which is why regular testing matters. When symptoms do appear, they can be easy to dismiss or mistake for something else. Knowing what to look out for helps you decide when to get checked, but don’t wait for symptoms — silent infections are common and can cause serious complications if untreated.
Here’s a practical guide to common STI symptoms in women.
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Common Symptoms by Infection
| Infection | Typical Symptoms |
|---|---|
| Chlamydia | Often none; sometimes unusual discharge, bleeding between periods, pain during sex, pelvic pain |
| Gonorrhoea | Often none; yellow/green discharge, painful urination, heavier periods, bleeding between periods |
| Trichomoniasis | Frothy yellow-green discharge with foul smell, itching, pain during sex |
| Herpes | Painful blisters and sores on or around the genitals |
| Genital warts | Small flesh-coloured growths |
| Syphilis | Painless ulcer, later rash on palms/soles, fever |
| HIV (seroconversion) | Flu-like illness 2-4 weeks after exposure, sometimes no symptoms |
Red Flag Symptoms
See a clinician promptly if you have:
- Unusual vaginal discharge (colour, smell, consistency change)
- Bleeding between periods or after sex
- Pain or burning on urination
- Pain during sex
- Itching or sores around the genitals
- Lower abdominal or pelvic pain
- Unexplained fever or swollen lymph nodes
- Rashes on the hands, feet or trunk
Symptoms That Don’t Mean STI
Some symptoms can suggest STI but often have other causes:
- Mild discharge changes during your cycle
- Yeast infections (not classed as STIs)
- BV (not officially an STI)
- UTIs (usually not sexually transmitted)
Testing helps distinguish these from STIs.
Silent Infections: Why Regular Testing Matters
Up to 70-80% of women with chlamydia have no symptoms. Gonorrhoea is often silent in women too. If undiagnosed, these infections can cause:
- Pelvic inflammatory disease (PID)
- Ectopic pregnancy
- Infertility
- Chronic pelvic pain
- Increased HIV susceptibility
Regular screening catches infections before complications develop.
When to Test
- Annual screening if you’re sexually active under 25
- With each new partner
- After unprotected sex
- If you develop any unusual symptoms
- If a partner tests positive
How to Test
- Home self-swab kits (free in many NHS areas)
- Sexual health clinic (walk-in or appointment)
- GP surgery
- Results usually within a few days
Read more: Vaginal infections | STI discharge | When to test
Frequently Asked Questions
Can I tell which STI I have from symptoms?
Not reliably. Several STIs cause overlapping symptoms. Testing gives a proper diagnosis.
Can I have an STI with no symptoms?
Yes — this is very common in women. Chlamydia, gonorrhoea and HPV are often silent.
Should I worry about normal discharge?
Normal vaginal discharge varies with your cycle and is not a sign of infection. Changes in colour, smell or consistency are what to watch for.
Related reading
- How Different STIs Affect Vaginal Discharge
- Is Testicular Pain a Sign of an STI?
- What Are Vaginal Bumps? Causes and When to Worry
- What Is a Female (Internal) Condom?
- White, Yellow, Green and Brown Vaginal Discharge: What It Means
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
