STI Symptoms in Women: What to Look For and When to Get Tested

Most women who contract a sexually transmitted infection will not develop obvious symptoms. That single fact drives most of the clinical problems I see at The Lagom Clinic. A patient comes in feeling well, sometimes months or even years after exposure, and a routine screen picks up an infection that has been quietly present the whole time. By that point, the infection may have already caused complications that were entirely preventable with earlier testing.

This is not about blame. STIs are common, they are infections like any other, and they respond well to treatment when caught early. The difficulty for women specifically is that the anatomy of the cervix, vagina, and urethra means many infections produce minimal or no noticeable change — at least in the early stages. So waiting for symptoms before seeking a test is, unfortunately, not a reliable strategy.

Below, I have outlined the symptoms that each of the most common STIs can cause in women, what to watch for, and what testing actually involves. If anything here sounds familiar, or if you simply have not been tested in a while, a sexual health screen is straightforward, quick, and genuinely worth the peace of mind.

Chlamydia symptoms in women

Chlamydia is the most frequently diagnosed STI in the UK, and roughly 70% of women with chlamydia will experience no symptoms at all. When symptoms do appear, they tend to develop between one and three weeks after exposure, though they can take longer.

What to look for

• Unusual vaginal discharge — often slightly different in colour or consistency from what is normal for you
• Pain or a burning sensation when urinating
• Bleeding between periods or after sex
• Pelvic pain or discomfort, particularly during sex
• If the rectum is affected, mild rectal discomfort or discharge

The concern with untreated chlamydia is pelvic inflammatory disease (PID), which can develop when the infection spreads to the uterus, fallopian tubes, or ovaries. PID can cause chronic pelvic pain and may affect fertility. This is why routine screening matters even when you feel perfectly well — chlamydia is one of the most treatable infections we see, usually clearing completely with a short course of antibiotics. Individual results do vary, and a follow-up test is sometimes recommended to confirm the infection has resolved.

Gonorrhoea symptoms in women

Gonorrhoea is less common than chlamydia but is increasing in prevalence across the UK, and antibiotic-resistant strains are a growing clinical concern. Like chlamydia, gonorrhoea frequently causes no symptoms in women — estimates suggest up to 50% of women with the infection are asymptomatic.

What to look for

• A change in vaginal discharge, which may become thinner, more watery, or take on a yellow or greenish tinge
• Pain or burning during urination
• Bleeding between periods
• Heavier periods than usual
• Pelvic pain, especially in the lower abdomen

Gonorrhoea can also infect the throat and rectum, depending on sexual contact, and these sites are often entirely asymptomatic. If you are at risk, mentioning this during your consultation ensures the right samples are taken. Left untreated, gonorrhoea — like chlamydia — can progress to PID, with the same potential consequences for long-term pelvic health and fertility.

Treatment usually involves a single injection of an antibiotic, sometimes combined with an oral dose. Because resistance patterns are shifting, we follow current UK guidelines on which antibiotics to use, and a test of cure is typically recommended two weeks after treatment.

Genital herpes symptoms in women

Genital herpes is caused by the herpes simplex virus (HSV), most commonly HSV-2, though HSV-1 (the virus that causes cold sores) can also affect the genital area. Many people carry the virus without knowing, and first outbreaks can occur weeks, months, or even years after initial exposure.

What to look for during a first outbreak

• Small blisters or sores around the vulva, vagina, or anus — these may burst and leave shallow, painful ulcers
• Pain or stinging when urinating, particularly if urine comes into contact with the sores
• An unusual tingling, itching, or burning sensation around the genitals
• Flu-like symptoms: aches, mild fever, swollen lymph nodes in the groin
• Vaginal discharge

First episodes tend to be the most uncomfortable. Recurrent outbreaks, if they happen, are usually shorter and less severe over time. Antiviral medication does not eliminate the virus, but it can significantly reduce the duration and severity of outbreaks and lower the risk of transmission. There is no stigma attached to a herpes diagnosis — it is an extremely common virus, and management is well-established.

A note on asymptomatic shedding

HSV can be passed on even when no visible sores are present. This is known as asymptomatic viral shedding, and it is one of the reasons herpes is so prevalent. If you have been diagnosed, your clinician can discuss suppressive therapy and practical ways to reduce transmission risk.

Trichomoniasis symptoms in women

Trichomoniasis is caused by a tiny parasite called Trichomonas vaginalis. It is less well known than chlamydia or gonorrhoea, but it is not rare, and symptoms can be quite noticeable when they occur. Around half of women with trichomoniasis develop symptoms, usually within a month of infection.

What to look for

• Vaginal discharge that may be frothy, yellow-green, and have an unusual or unpleasant smell
• Soreness, itching, or redness around the vulva and vagina
• Discomfort during sex
• Pain when urinating

Trichomoniasis is treatable with a course of antibiotics, typically metronidazole. It is important that sexual partners are treated at the same time, as reinfection is common if this step is missed. Individual responses to treatment can vary, and your clinician will advise on what to expect.

Syphilis symptoms in women

Syphilis rates have risen significantly across the UK in recent years, and it is no longer an infection that can be considered rare. Syphilis progresses through distinct stages, each with different clinical features. Early-stage syphilis is highly treatable, but if it is missed, later stages can cause serious systemic complications.

Primary syphilis

The first sign is typically a single, painless sore (called a chancre) at the site of infection. In women, this is often on the vulva, inside the vagina, or around the anus. Because the chancre is painless and may be in a location that is not easily visible, it is frequently missed. The sore heals on its own within a few weeks — but the infection remains.

Secondary syphilis

If primary syphilis is not treated, secondary syphilis can develop weeks to months later. Symptoms may include:

• A rash, often on the palms of the hands and soles of the feet, though it can appear elsewhere on the body
• Flu-like symptoms: fatigue, headaches, swollen lymph nodes, sore throat
• Flat, wart-like growths around the vulva or anus (condylomata lata)
• Patchy hair loss

These symptoms also resolve without treatment, which can give a false sense of reassurance. The infection then enters a latent phase, where it causes no symptoms but remains in the body. Late-stage (tertiary) syphilis is now uncommon in the UK thanks to screening and treatment, but it can affect the heart, brain, and nervous system.

Syphilis is detected through a blood test. Treatment is straightforward in the early stages — typically a course of penicillin injections — and outcomes are generally very good when the infection is caught early.

HIV — early symptoms in women

HIV (human immunodeficiency virus) attacks the immune system. With modern antiretroviral treatment, people diagnosed with HIV can expect to live long, healthy lives — but early diagnosis is important for both individual health and reducing onward transmission.

What to look for in the early weeks

Within two to six weeks of infection, many people experience a short illness sometimes called a seroconversion illness. Symptoms can include:

• Fever
• Sore throat
• A body rash, often on the torso
• Fatigue and general malaise
• Joint and muscle pain
• Swollen lymph nodes

These symptoms closely resemble a viral illness such as flu and are easily attributed to something else. After this initial phase, HIV may cause no symptoms for years. The only way to know your status is to test. If you think you may have been exposed, the timing of testing matters — speak with a clinician about the appropriate window period for accurate results.

It is worth noting that an HIV diagnosis is not what it was 20 or 30 years ago. Effective antiretroviral therapy means that people on treatment with an undetectable viral load cannot pass on the virus — a principle known as U=U (undetectable = untransmittable). Testing is a positive step, whatever the result.

When to get tested

There is no minimum threshold of risk that qualifies you for a test. If you are wondering whether you should be tested, that in itself is a reasonable reason to go ahead. That said, testing is particularly advisable in the following situations:

• You have a new sexual partner, or your partner has had other partners
• You have had unprotected sex (vaginal, anal, or oral)
• A condom has broken or slipped during sex
• A current or former partner has told you they have been diagnosed with an STI
• You are experiencing any of the symptoms described above
• You are planning a pregnancy — screening before or early in pregnancy protects both you and your baby
• You have not been tested before, or it has been more than a year since your last screen

Routine screening between partners is a sensible, proactive step. It is not a reflection of distrust — it is basic healthcare, no different from a blood pressure check or a smear test.

What STI testing involves

One of the most common things I hear from patients is that they put off testing because they were not sure what to expect. In reality, the process is simple, quick, and far less uncomfortable than most people anticipate.

During a sexual health screening at The Lagom Clinic

A consultation begins with a confidential conversation. I will ask about your sexual history, any symptoms you have noticed, and what you are concerned about. This is not to judge — it is to make sure we test for the right things. Everything discussed is strictly confidential.

The tests themselves typically include some or all of the following:

• Urine sample — used to test for chlamydia and gonorrhoea. You simply provide a sample in a pot; no catheter or invasive procedure is involved
• Vaginal swab — this can often be self-taken, which many patients prefer. It tests for chlamydia, gonorrhoea, and trichomoniasis
• Blood test — a small blood draw from the arm, used to screen for HIV, syphilis, and hepatitis B and C
• Throat or rectal swabs — offered where relevant, based on the type of sexual contact you have had

The entire appointment typically takes around 30 minutes, including the consultation. Results are usually available within two to five days, and we contact you directly with the outcome.

If a test comes back positive, we discuss treatment options during a follow-up consultation. Most STIs are straightforward to treat, and we handle everything in-house at the clinic in Redland, Bristol. Partner notification and treatment guidance are part of the service — we can advise you on the best way to handle that conversation if needed.

Consultations are available from £125 for 30 minutes. Same-week appointments are often available, and the clinic is a discreet, private setting — there is no waiting room full of other patients, and no visible signage that identifies the nature of your visit.

If you would like to book a sexual health screening, you can do so through our website or by contacting the clinic directly.

Frequently asked questions

Can you have an STI with no symptoms at all?

Yes, and this is very common. Chlamydia, gonorrhoea, HIV, syphilis, trichomoniasis, and herpes can all be present without causing any noticeable symptoms, sometimes for months or years. This is why routine screening is important — symptoms alone are not a reliable indicator of whether you have an infection.

How soon after unprotected sex can I get tested?

It depends on the infection. Chlamydia and gonorrhoea can usually be detected from around two weeks after exposure. HIV tests are most accurate from four weeks onwards, with a confirmatory test at three months for complete reassurance. Syphilis blood tests typically become reliable at four to six weeks. If you attend the clinic soon after a possible exposure, we can advise on the best testing timeline and whether an early screen followed by a repeat test is appropriate.

Is STI testing painful?

No. A urine sample and a self-taken vaginal swab are the most common tests, and neither is painful. Blood tests involve a standard needle draw from the arm — no worse than any routine blood test. Throat and rectal swabs, if needed, take only a few seconds and cause minimal discomfort.

Will my GP or anyone else find out about my results?

Your results at The Lagom Clinic are confidential. We do not share them with your NHS GP unless you specifically ask us to, and we do not notify employers, insurers, or anyone else. The consultation and results are between you and your clinician.

Can STIs affect fertility?

Some can, if left untreated. Chlamydia and gonorrhoea are the main concerns — both can cause pelvic inflammatory disease, which may lead to scarring of the fallopian tubes and affect fertility. This is one of the strongest arguments for routine screening, particularly before planning a pregnancy. Early detection and treatment significantly reduce this risk.

I am in a long-term relationship. Do I still need to be tested?

It can still be worthwhile. Some infections have long incubation periods and may have been acquired before your current relationship. If neither partner has been tested, a baseline screen gives both of you clarity and peace of mind. It is a straightforward, undramatic thing to do together — and it removes any uncertainty.

Dr Jack Ogden is a GMC-registered GP and the clinical lead at The Lagom Clinic in Redland, Bristol. If you have questions about any of the symptoms described above, or would like to arrange a sexual health screening, you can book online or contact the clinic directly.