Sexual health

Under 25? Why Annual Chlamydia Screening Matters

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Sexually active women under 25 are advised to test yearly for chlamydia because it is most common at this age and often causes no symptoms. Untreated, it can spread to the tubes and cause pelvic inflammatory disease, a preventable cause of infertility. A positive result is highly treatable.

Last updated: July 2026

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Do women under 25 really need a yearly chlamydia test?

Yes — annual chlamydia testing is advised for sexually active women under 25, and it is one of the most useful screenings in this age group. Chlamydia is most common in the late teens and early twenties, and it frequently causes no symptoms at all, so screening finds infections that would otherwise go unnoticed 1. Gonorrhea testing is usually paired with it for the same reasons, since it too is often silent. The goal is early treatment before an infection can spread upward and damage the reproductive tract. Because so many cases are quiet, an infection with no symptoms is exactly what yearly testing is designed to catch.

Why does a silent infection matter so much?

An untreated chlamydia infection can quietly travel from the cervix into the uterus and fallopian tubes, causing pelvic inflammatory disease. Scarring from that inflammation is a leading, preventable cause of tubal infertility 2, and it can also raise the risk of a future ectopic pregnancy. According to the World Health Organization, roughly 1 in 6 adults experience infertility, and pelvic infection from untreated STIs is one preventable contributor 2. The stakes are why screening focuses on catching infection early, while it is still confined to the cervix and easily treated. Early chlamydia symptoms, when they appear at all, are easy to miss or mistake for something else.

How is the test done, and how often?

Chlamydia screening is simple: a urine sample or a self-collected vaginal swab, with no pelvic exam required for the test itself. The World Health Organization recommends self-collected sampling as a valid option that can make testing easier and more private 3. For sexually active women under 25, once a year is the baseline, with additional tests after a new partner or a partner's diagnosis. A repeat test about 3 months after treatment is commonly advised, because re-infection from an untreated partner is common. Knowing how often to get tested and what a test checks for makes it easier to ask for the right screen.

What happens if a test comes back positive?

A positive chlamydia test is common and highly treatable, usually cleared with a short course of antibiotics prescribed by a clinician. Partners from the past 2 months are typically tested and treated as well, which prevents the ping-pong re-infection that undermines one person's treatment 1. Left untreated, the same infection that is silent today can cause pelvic inflammatory disease later, so follow-through matters more than the diagnosis itself 2. Sexual activity is usually paused until treatment is complete and any symptoms resolve. Because re-infection from an untreated partner is common, testing again a few months later confirms the infection is truly gone. According to sexual-health guidance, treating partners and re-testing are what turn a positive result into a fully resolved one 1.

When chlamydia screening needs a clinician

A yearly conversation with a primary care clinician or gynecologist is the simplest way to keep chlamydia screening on track through the higher-risk years. A clinician can order the test, treat a positive result, arrange partner treatment, and advise on re-testing and prevention. Screening needs change across the lifespan: the under-25 years carry the highest chlamydia rates, pregnancy adds routine testing to protect the baby, and risk-based testing continues whenever partners change. Condoms and prompt treatment of partners lower the odds of re-infection between yearly screens, which keeps the protection continuous. Symptoms like lower-abdominal pain, fever, or unusual bleeding deserve prompt attention rather than waiting for the annual visit. Gale can help you keep track of when your next screening is due.

Common questions

Chlamydia rates are highest in the late teens and early twenties, so yearly screening in this group catches the most infections for the effort. After 25, testing is guided by risk factors such as new or multiple partners. The age cutoff reflects where the infection is most common, not a sudden change in risk on a birthday.

Yes, very often. A large share of chlamydia infections cause no noticeable symptoms in women, which is the main reason routine screening exists. Because a silent infection can still spread and cause damage over time, testing is the only reliable way to know your status, even when you feel completely fine.

It helps. Catching and treating chlamydia early prevents it from spreading to the uterus and fallopian tubes, where scarring can cause infertility and raise ectopic pregnancy risk. Regular screening in the higher-risk years is one of the more effective ways to protect future fertility from a preventable cause.

It is straightforward. Testing uses a urine sample or a self-collected vaginal swab, and no pelvic exam is needed for the test itself. Results guide whether treatment is needed. If a test is positive, a clinician can prescribe treatment and help arrange testing and treatment for recent partners.

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When chlamydia screening needs prompt attention

  • —Lower-abdominal or pelvic pain, fever, or abnormal bleeding — especially after a positive test — can signal pelvic inflammatory disease and is a reason to seek same-day clinician care.
  • —A positive chlamydia test in you or a partner is a reason to seek clinician treatment and arrange partner testing.
  • —Pain with sex, unusual discharge, or bleeding between periods is a reason to seek clinician review and testing.
  • —Pain with urination or new pelvic pain is a reason to seek clinician evaluation.

Lower-abdominal pain with fever, severe pelvic pain, or heavy abnormal bleeding can indicate pelvic inflammatory disease and warrants urgent, same-day medical care. Go to urgent care or an emergency room if symptoms are severe.

This article is general health education, not medical advice. Whether and how often you need chlamydia screening should be decided with a primary care clinician or gynecologist.

References

  1. 1.MedlinePlus (National Library of Medicine) (2024). Vaginitis. MedlinePlus, U.S. National Library of Medicine (NIH). link ✓Supports that chlamydia and related infections are frequently asymptomatic in women and that clinician testing and treatment, including partner treatment, are needed to resolve them.
  2. 2.World Health Organization (2025). Infertility (fact sheet). World Health Organization (WHO). link ✓Supports that pelvic infection from untreated STIs is a preventable cause of tubal infertility and that roughly 1 in 6 adults experience infertility.
  3. 3.World Health Organization (2022). WHO guideline on self-care interventions for health and well-being, 2022 revision. World Health Organization (WHO). link ✓Supports self-collected sampling as a valid, accessible option for chlamydia screening.

3 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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