Most people Google STI symptoms because they noticed something and are now worried. That is the entirely sensible reaction. This page is an honest, plain-language guide to what is — and is not — typically an STI symptom in Ireland, and the much more important thing: when to test even if you have no symptoms at all, because the majority of STIs are silent.
Quick decision: should you test?
If any of these are true, the answer is yes — and testing is free in Ireland.
- You had unprotected sex with a new partner in the last 3 months.
- A partner has told you they tested positive for something.
- You've noticed unusual discharge, a sore, a lump, burning, or persistent itching.
- You're starting a new relationship and want to know.
- You just want to know. No reason required.
The most important sentence on this page
Most STIs in Ireland do not produce symptoms.
That is not a clever turn of phrase. It is the actual epidemiology. The HSE estimates that most chlamydia cases are silent. A large share of gonorrhoea, syphilis, herpes and HIV cases are silent at first. If you base your decision to test on "do I have symptoms?", you will miss a lot of infections — including some of the ones that matter the most to catch early.
The right question is not "do I have symptoms?" — it is "have I had a recent exposure I want to know about?"
What is actually a symptom?
When there are symptoms, here is the short, honest list. This is not exhaustive and individual conditions are covered in detail on their own pages — link at the end of each row.
| What you notice | What it might mean |
|---|---|
| Unusual discharge from the penis, vagina or rectum (clear, white, yellow, green) | Possible chlamydia, gonorrhoea, trichomoniasis, or bacterial vaginosis. Often also caused by non-STI things like thrush. |
| Burning or stinging when peeing | Possible chlamydia or gonorrhoea. Also a classic urinary-tract-infection (UTI) symptom — not always sexual. |
| A painful blister or sore on the genitals, mouth or anus | Most likely herpes (HSV-1 or HSV-2). A painless sore is more concerning — possible syphilis. Either way, get it checked. |
| A small painless lump, bump, or "cauliflower" growth | Most likely genital warts (HPV). |
| Pain during sex (dyspareunia) | Possible chlamydia or pelvic inflammatory disease (PID) in people with a uterus; in others can be many causes including non-STI. |
| Bleeding between periods, or after sex | Worth getting checked for chlamydia and other infections. Also caused by many non-STI things — contraception change, cervical issues, etc. |
| Itching in the pubic area, especially at night | Possible pubic lice or scabies. Also caused by shaving, eczema, fabric irritation. |
| Flu-like illness 2–4 weeks after unprotected sex | Could be early HIV seroconversion. Also obviously could be flu. Worth a test. |
| Swollen lymph nodes in the groin, fatigue, weight change | Many possible causes including untreated infections. Get a full screen. |
What is more likely not an STI
Anxiety leads a lot of people to read STI symptoms into things that are very rarely STIs. The most common false alarms in Ireland:
- Itching alone, without discharge or sores. Far more often: thrush, soap or detergent irritation, eczema, shaving rash, fabric reaction.
- One painful pee. Drink water, see how it goes. Persistent burning is worth checking — UTIs and STIs both do this.
- A spot or pimple that came and went in a day. Usually exactly what it looks like — a spot.
- Genital area looking "different" after careful inspection. A lot of normal anatomical variation gets misread under a worried 2am light. If you're not sure, a clinician can tell you in 30 seconds.
- Symptoms hours after sex. Most STI symptoms (if they appear at all) take days to weeks — not hours.
This isn't to talk you out of testing. If you're worried, test. The point is that anxiety alone is not a reason to be certain you have something.
How long after sex would symptoms appear?
Rough guide. These are when symptoms typically first appear in the people who get symptoms at all. Many people get none.
- Chlamydia, gonorrhoea: 1–3 weeks after exposure
- Herpes (first outbreak): 2–12 days after exposure; can be longer
- Syphilis (primary sore): 10 days to 3 months after exposure
- HIV (early seroconversion): 2–4 weeks; or no early symptoms
- HPV (genital warts): weeks to months; sometimes years
- Trichomoniasis, BV, mycoplasma: variable, often vague
Window periods — when can a test detect it?
Tests are not instant after exposure. Each STI has a "window period" — the time it takes for the infection to be detectable in a test:
- Chlamydia / gonorrhoea: reliable from 2 weeks after exposure
- HIV (4th-generation lab test): reliable from 4 weeks after exposure; 12 weeks for the most conservative confidence
- Syphilis: reliable from 3 weeks after exposure; 12 weeks for full confidence
- Hepatitis B/C: reliable from 6 weeks after exposure
If you test too early, you can get a false-negative. The clinic or home-test instructions will tell you the right timing — and you can always re-test later. If you've had a possible exposure and you're worried about HIV, the HSE clinic can also discuss PEP (post-exposure prophylaxis) — but it has to start within 72 hours of exposure.
When to test even if you have zero symptoms
- After any unprotected sex with a new partner — wait the window period, then test.
- At the start of a new relationship, if you both want to.
- Annually if you have multiple partners.
- Before trying to get pregnant (your antenatal screen will check anyway, but earlier is better).
- Any time you just want to know.
What if you do have something?
Briefly, because this is covered properly in What is an STI? — the honest answer is that almost every STI in Ireland is either curable with antibiotics, manageable with a tablet when needed, or — for HIV specifically — treatable to the point that people on treatment live normal lifespans and cannot pass it on. The clinic will tell you what you have, treat it, and help with partner notification if needed.
Where to go from here
- How testing actually works — what happens at the clinic, step by step
- Where to test by county — every free HSE clinic in Ireland
- What is an STI? — the broader explainer
- All condition guides
Important: Nothing on STI.ie is medical advice. Always speak to a clinician for diagnosis. HSE Sexual Health Line: 1800 700 700 (free, anonymous).