Sexually transmitted infections, or STIs, are common, and many can spread even when a person has no symptoms. That is why prevention and screening work best together. Prevention lowers risk before exposure, while screening can find infections early so they can be treated and so partners can be protected.
The title of this guide uses the phrase “reduce your risk of STI screening,” but the practical goal is usually to reduce your risk of STIs and to use screening wisely. STI screening itself is not the problem. In fact, testing is one of the most important ways sexually active people can protect their health.
Risk reduction does not require shame, fear, or avoiding healthcare. It means using the right prevention tools for your life: condoms, vaccines, testing, partner communication, HIV prevention medicines when appropriate, and follow-up when symptoms or exposures happen.
What Is STI Screening?
STI screening means testing for sexually transmitted infections before symptoms appear. This matters because chlamydia, gonorrhea, syphilis, HIV, hepatitis B, hepatitis C, trichomoniasis, herpes, and other infections may not cause obvious symptoms right away.
Screening is different from diagnostic testing. Diagnostic testing happens when symptoms are present, such as discharge, sores, pelvic pain, testicular pain, burning with urination, rash, fever, or pain during sex. Screening happens based on risk, age, pregnancy status, partners, sexual practices, and medical history.
The CDC states that if you are sexually active, STI testing is one of the most important things you can do to protect your health. It also advises having an open and honest conversation with a healthcare provider about sexual history and STI testing, even if you use a self-test or self-collection kit.
Checklist Step 1: Know Your Personal Risk Factors
STI risk is not the same for everyone. It depends on the type of sex, number of partners, condom use, partner testing history, local infection rates, pregnancy status, HIV status, use of PrEP, prior STIs, injection drug use, and whether partners have other partners.
A practical risk check includes five questions: Who are your partners? What types of sex do you have? What protection do you use? Have you or your partners had STIs before? Is pregnancy possible or intended?
The CDC’s STI treatment guidance describes this as the “Five P’s” approach: partners, practices, protection from STIs, past history of STIs, and pregnancy intention.
Checklist Step 2: Use Condoms Correctly and Consistently
Condoms can lower the risk of many STIs when used the right way every time. They are especially important for infections spread through semen, vaginal fluids, rectal fluids, or blood.
Use a new condom for each sex act, check the expiration date, store condoms away from heat and friction, use the right lubricant, and avoid oil-based lubricants with latex condoms. Condoms should be put on before genital contact and used throughout sex.
The CDC lists using condoms the right way every time you have sex as a key STI prevention step. Condoms do not prevent every STI perfectly, especially infections spread by skin-to-skin contact in areas not covered by a condom, but they remain an important layer of protection.
Checklist Step 3: Get Vaccinated When Eligible
Some infections linked with sexual contact can be prevented with vaccines. HPV vaccination helps protect against HPV types that can cause cervical, anal, throat, penile, vulvar, and vaginal cancers, as well as genital warts. Hepatitis B vaccination protects against a virus that can spread through sex and blood.
Hepatitis A vaccination may also be recommended for some people based on risk, travel, liver disease, or other health factors. Ask your healthcare provider which vaccines you need based on age, health history, sexual history, and prior vaccine records.
The CDC notes that vaccines are recommended for some people to prevent hepatitis B and HPV.
Checklist Step 4: Test Before New or Multiple Partners
Testing before sex with a new partner can reduce uncertainty and help both people make informed choices. It is especially useful when condoms may not be used consistently or when partners are becoming sexually exclusive.
Testing is not a one-time guarantee. Some infections have window periods, meaning they may not show up immediately after exposure. If there was a recent exposure, a repeat test may be needed later.
Ask your healthcare provider which infections to test for and which body sites to test. Depending on sexual practices, throat, rectal, urine, vaginal, cervical, or blood testing may be needed.
Checklist Step 5: Match Testing to the Type of Sex You Have
STI testing should match exposure sites. A urine test alone may miss infections in the throat or rectum. A blood test alone may not detect chlamydia or gonorrhea at exposed sites.
Tell your clinician whether you have oral, vaginal, anal, insertive, receptive, or shared-toy exposures. This helps determine whether throat swabs, rectal swabs, urine samples, vaginal swabs, cervical swabs, or blood tests are appropriate.
Being specific helps improve accuracy. Clinicians need this information to order the right tests, not to judge your behavior.
Checklist Step 6: Consider HIV PrEP if You Are at Higher Risk
PrEP, or pre-exposure prophylaxis, is medicine taken to reduce the chance of getting HIV before exposure. It may be an option for people with higher HIV risk, such as those with a partner who has HIV, people with recent bacterial STIs, people who do not use condoms consistently, or people with certain sexual or injection-related risks.
PrEP does not protect against other STIs such as chlamydia, gonorrhea, syphilis, HPV, or herpes. People on PrEP still need STI screening, HIV testing, medication follow-up, and prevention counseling.
If you think PrEP may fit your situation, ask a healthcare provider or sexual health clinic. PrEP options and follow-up schedules can vary based on medication type and medical history.
Checklist Step 7: Know About HIV PEP After a Possible Exposure
PEP, or post-exposure prophylaxis, is emergency medicine that may help prevent HIV after a possible exposure. It must be started quickly, usually within 72 hours.
PEP may be considered after condom breakage, sexual assault, needle exposure, or sex with a partner who has HIV or unknown HIV status when the exposure is considered high risk.
Do not wait for symptoms after a possible HIV exposure. Contact urgent care, an emergency department, a sexual health clinic, or a healthcare provider right away to ask whether PEP is appropriate.
Checklist Step 8: Ask Whether Doxy PEP Applies to You
Doxy PEP is the use of doxycycline after sex to reduce the chance of certain bacterial STIs in specific groups. It is not for everyone and should be used only with medical guidance.
The CDC states that taking doxycycline within 72 hours after sex can help some people reduce the chances of getting STIs, and that current guidelines focus on specific groups where doxy PEP has proven effective. CDC also emphasizes that regular HIV and STI screening remains important.
Do not use leftover antibiotics or someone else’s prescription. Doxy PEP decisions should include discussion of benefits, side effects, pregnancy considerations, medication interactions, antimicrobial resistance, and follow-up testing.
Checklist Step 9: Communicate With Partners Before Sex
Partner communication can reduce risk, but it works best when it happens before sex. Useful topics include recent STI testing, condom use, PrEP use, birth control, exclusivity, other partners, symptoms, and what to do if someone tests positive later.
A simple question can be enough to start: “When were you last tested, and what were you tested for?” Another useful question is: “What protection do you want us to use?”
These conversations may feel awkward at first, but they can prevent confusion and protect both people’s health.
Checklist Step 10: Avoid Sex During Symptoms or Treatment
If you or a partner has STI symptoms, avoid sex until testing and medical guidance are complete. Symptoms may include sores, blisters, rash, discharge, pelvic pain, testicular pain, burning with urination, rectal pain, bleeding, fever, or pain during sex.
If you are treated for an STI, follow instructions about how long to avoid sex and whether partners need treatment. Having sex too soon can lead to reinfection or transmission to partners.
Do not assume symptoms are harmless because they improve on their own. Some infections can come and go while still needing diagnosis and treatment.
Checklist Step 11: Treat Partners and Prevent Reinfection
When someone tests positive for an STI, partners may also need testing and treatment. This protects partners and reduces the chance of getting the same infection again.
Partner notification can be done directly, through a clinic, or through public health partner services depending on the infection and location. Some areas allow expedited partner therapy for certain infections, where partners receive treatment without a separate exam.
Ask the clinician how partners should be notified, tested, or treated, and when sex can safely resume.
Checklist Step 12: Use At-Home Tests Carefully
At-home STI tests and self-collection kits can improve privacy and access. They may be helpful for people who cannot easily visit a clinic or prefer collecting samples at home.
However, home tests have limits. Some may not test all needed body sites, may not include every infection, may require careful sample collection, or may need confirmatory testing. Results also need follow-up when positive, unclear, or inconsistent with symptoms.
CDC advises talking openly with a healthcare provider about sexual history and STI testing even if you receive results from a self-test or self-collection kit.
Common Mistake: Thinking No Symptoms Means No STI
Many STIs can be silent. A person may feel completely well and still have an infection that can affect their health or spread to partners.
This is why screening matters. Waiting for symptoms can delay treatment and increase the chance of complications or transmission.
If you are sexually active, ask how often you should be screened based on your personal risk factors.
Common Mistake: Testing Only Once
A negative test is helpful, but it reflects a point in time and the infections tested. It may not capture recent exposures during a window period, future exposures, or infections at untested sites.
People with new partners, multiple partners, condomless sex, prior STIs, or partners with unknown status may need repeat screening. Pregnant people and people on PrEP may also have specific screening schedules.
Ask your clinician what repeat testing schedule fits your situation.
Common Mistake: Assuming Birth Control Prevents STIs
Birth control methods such as pills, IUDs, implants, shots, rings, and emergency contraception can reduce pregnancy risk, but they do not protect against STIs.
If pregnancy prevention and STI prevention are both goals, condoms may be used along with another birth control method. This is sometimes called dual protection.
Talk with a healthcare provider if you need both pregnancy prevention and STI risk reduction.
Common Mistake: Using Antibiotics Without Testing
Using antibiotics without diagnosis can cause problems. The wrong antibiotic may not treat the infection, may hide symptoms, may cause side effects, and may contribute to antibiotic resistance.
Some STIs require specific treatment, and some partners need treatment too. Testing helps identify the infection and the right medication.
Do not use leftover antibiotics or antibiotics purchased without medical guidance for STI symptoms or exposures.
When to Get Screened
Get screened based on your age, pregnancy status, partners, sexual practices, symptoms, prior infections, HIV status, PrEP use, and local recommendations.
The CDC recommends regular screening for sexually active people based on risk, including specific recommendations for women, pregnant people, men who have sex with men, people with HIV, and others. Screening may include HIV, syphilis, chlamydia, gonorrhea, hepatitis, or other tests depending on the situation.
Ask your provider: “Which STIs should I be tested for, which body sites should be tested, and when should I repeat testing?”
When to Talk to a Healthcare Provider
Talk to a healthcare provider if you have a new partner, multiple partners, condomless sex, a partner with an STI, STI symptoms, pregnancy, possible HIV exposure, sexual assault, or questions about PrEP, PEP, doxy PEP, vaccines, or testing frequency.
You should also seek care if you test positive on an at-home test, receive a partner notification, have symptoms after treatment, or think you may have been reinfected.
A provider may recommend testing, treatment, partner services, vaccines, HIV prevention medication, pregnancy testing, contraception counseling, or follow-up testing after treatment.
When to Seek Urgent Care
Seek urgent care after a possible HIV exposure because PEP must be started quickly to be effective. Also seek urgent care after sexual assault, severe pelvic pain, testicular pain, fever with pelvic or genital symptoms, severe abdominal pain, pregnancy with pain or bleeding, or signs of a serious infection.
Sudden severe testicular pain can be an emergency and should not wait for routine STI testing. Severe pelvic pain with fever, fainting, or pregnancy symptoms also needs prompt evaluation.
Call emergency services if symptoms are severe, sudden, or could involve assault, major bleeding, fainting, severe allergic reaction, or another medical emergency.
The Bottom Line
STI prevention and STI screening work together. Prevention lowers exposure risk, while screening helps find infections early when they may have no symptoms.
Practical prevention steps include condoms, vaccines, testing before new partners, site-specific screening, partner communication, avoiding sex during symptoms or treatment, PrEP for HIV when appropriate, PEP after possible HIV exposure, and doxy PEP for selected people under medical guidance.
The most common mistakes are assuming no symptoms means no STI, testing only once, relying on birth control for STI protection, skipping partner treatment, and using antibiotics without testing or clinician guidance.
If you are sexually active, ask a healthcare provider what screening schedule and prevention tools fit your actual risks and goals.