STI Symptoms in Women: What to Look For, and What Stays Silent

The single most important fact about sexually transmitted infections is the one least often said: most of them cause no symptoms at all, especially in women. The World Health Organization estimates that more than a million curable infections are acquired worldwide every day, and that the majority are silent.

That is why "I feel fine" is not evidence of anything, and why the damage these infections do — blocked tubes, ectopic pregnancy, infertility, problems in pregnancy — usually happens quietly, years before anyone connects it to an infection nobody ever noticed.

Symptoms that should prompt a test

None of these proves an STI, and their absence does not rule one out. But each is a reason to be checked rather than to wait:

Infection by infection

Chlamydia is the commonest bacterial STI and the quietest. Only about 5 to 30% of women with a confirmed infection develop symptoms, which when present are an altered discharge, spotting after sex, burning urine or pelvic pain. It is curable with a short course of antibiotics. Left alone it climbs to the tubes.

Gonorrhoea causes a thicker yellow-green discharge, burning urine and sometimes bleeding between periods — but in women it too is frequently silent. It can also infect the throat and rectum, where it almost never causes symptoms. It is curable, but it is the one to take seriously on drug resistance: India's 2024 national STI guidelines doubled the recommended injectable dose precisely because the organism is becoming harder to kill.

Trichomonas is a parasite, and it is the one infection on this list that usually does announce itself: a frothy, greenish, strong-smelling discharge with soreness and itching. It is curable, and it is easily missed on a routine examination.

Syphilis matters more than its rarity suggests. It begins with a painless ulcer that heals by itself — which is exactly why it is ignored — and weeks later can produce a rash, often on the palms and soles, with fever and swollen glands. Untreated it goes quiet for years and then damages the heart and nervous system. It is curable at every stage, and it is rising: at India's designated STI clinics, syphilis test positivity went up from 0.49% in 2020-21 to 0.9% in 2023-24. Globally, 1.1 million pregnant women had syphilis in 2022, causing over 390,000 adverse birth outcomes — stillbirths, newborn deaths and babies born infected. This is why every pregnant woman is tested, and why the test is repeated if there is any new risk.

Genital herpes causes painful blisters and ulcers, often with flu-like symptoms the first time, then recurrences that get milder. Many people carry it with no idea: about 520 million people aged 15 to 49 worldwide — roughly 13% — have HSV-2. It is not curable, but it is very controllable with medication, and it matters in pregnancy mainly if a first infection happens near delivery.

HPV usually causes nothing at all. Some types cause genital warts; other, high-risk types can, over many years, cause cervical cancer. Most infections clear by themselves. This is the one you can vaccinate against — see HPV explained and HPV vaccination — and the one screening is designed to catch, through the Pap smear and HPV test.

HIV often causes a short flu-like illness a few weeks after infection — fever, sore throat, rash, swollen glands — and then nothing for years. Adult prevalence in India is low, around 0.2% in national estimates, but low is not zero, and treatment today is so effective that a person on treatment with an undetectable viral load does not transmit it sexually. The whole benefit depends on knowing.

Hepatitis B is sexually transmitted, often silent, vaccine-preventable, and tested for in pregnancy because it can pass to the baby at birth.

Mycoplasma genitalium is the newer name on the list, added to India's 2024 national guidelines. It causes persistent discharge or urethral symptoms that do not settle with the usual treatment.

What happens if they are not treated

The reason to find a silent infection is what it does while nobody is looking. In a UK study of 857,324 women followed through primary care records, those who tested positive for chlamydia had, compared with women who tested negative:

• Pelvic inflammatory disease: about 2.4 times the risk — 5.4 versus 1.4 cases per 1,000 women per year.
• Ectopic pregnancy: about 1.9 times the risk.
• Infertility: about 1.9 times the risk.
• Repeat infections raised the risk further than a single one.

Put plainly: the tubes are the casualty. Pelvic infection scars them, and scarred tubes are how an ectopic pregnancy and tubal infertility happen. In India this sits alongside another silent cause of the same damage, genital tuberculosis.

Testing: what, and when

Tests are specific, so it helps to know what is being asked for. In practice this means a swab, a urine sample, a blood test, or some combination.

• Chlamydia and gonorrhoea — a swab or urine sample, usually about two weeks after the exposure you are worried about.
• Trichomonas, thrush and bacterial vaginosis — a swab, best taken while symptoms are present.
• Syphilis, HIV and hepatitis B — blood tests.
• Herpes — a swab from a fresh blister or ulcer, which is why it is worth being seen while the sore is there rather than after it heals.
• HPV — not a symptom test but a screening test, done with or instead of a Pap smear from the recommended age.

The window period is the part people get wrong. A test done too early can be negative even when an infection is present. For HIV, the US Centers for Disease Control give these ranges after exposure: a nucleic acid test detects infection at 10 to 33 days, a laboratory antigen/antibody test at 18 to 45 days, a rapid finger-stick antigen/antibody test at 18 to 90 days, and antibody-only tests at 23 to 90 days. Syphilis serology can also take weeks to turn positive. If you test early, you will usually be asked to repeat it.

In pregnancy, HIV and syphilis testing is routine, and India's 2024 guidelines recommend dual HIV-syphilis rapid tests to make that simpler. Hepatitis B is tested too. If you are planning a pregnancy, these are part of preconception counselling.

Treatment, and the part that gets skipped

• Finish the course. Symptoms settle long before the infection is gone.
• Your partner needs treating too, even with no symptoms. Treating one person and not the other is the commonest reason an infection returns within weeks and gets blamed on "low immunity".
• No sex until you have both completed treatment and been told it is safe — usually a week after a single-dose treatment, longer for a course.
• A repeat test is advised after some infections, and a re-test at three months is common after chlamydia or gonorrhoea, because re-infection is frequent.
• Do not self-treat from a chemist. The wrong antibiotic, at the wrong dose, is how resistant gonorrhoea is being created, and it also masks syphilis without curing it.

Government STI clinics across India work on enhanced syndromic case management — treating the pattern of symptoms immediately using standard colour-coded medicine kits, with laboratory testing wherever it is available. It saves lives where testing is slow. Its weakness is exactly the problem this page started with: a woman with no symptoms has no syndrome, so nothing is treated.

Confidentiality, plainly

Fear of being judged or exposed is the main reason Indian women delay this. Two things are worth knowing. Testing and treatment are confidential, and under the HIV and AIDS (Prevention and Control) Act 2017 HIV testing requires your informed consent and your status is legally protected. And the doctor you see is treating a patient, not conducting an enquiry — you will be asked what is clinically relevant and nothing more.

Prevention that actually works

• Condoms, used consistently. They reduce, but do not abolish, the risk of infections spread by skin contact such as herpes and HPV.
• Vaccination against HPV and hepatitis B.
• Testing at the start of a new relationship, both partners, which is a normal and unromantic thing to do.
• Screening in pregnancy, and again later if there is new risk.
• Not douching. It disturbs the normal bacteria and makes infection more likely, not less.

Myths worth dropping

• "You can catch it from a toilet seat." Essentially no.
• "Only people with many partners get these." One partner is enough, and most women who test positive have had very few.
• "My husband has no symptoms, so I am fine." Men are often silent carriers too, particularly with chlamydia.
• "It went away, so it is cured." A syphilis ulcer heals on its own while the infection continues. So does a herpes outbreak.
• "Any discharge means an STI." Most discharge is normal or is thrush or BV.

What happens at the clinic

Consultation, examination, swabs, urine tests and blood tests including HIV, syphilis and hepatitis B, Pap smear and HPV testing, treatment, partner advice and vaccination are all done at the clinic. Scans, where pelvic infection needs one, are arranged by referral and reviewed with you here. Admission for severe pelvic infection, if it is ever needed, is at an NABH-accredited hospital.

If you are here because of one symptom and are hoping it is nothing, the useful move is a test rather than a search engine. Most results are reassuring, most infections found are curable, and the ones that are not are far easier to live with when they are known about.