Can you have an STD without symptoms? When to get tested

Many people believe they would know if they had a sexually transmitted disease (STD).

Unfortunately, that's one of the biggest myths about sexual health.

The truth is that many sexually transmitted diseases (STDs) - known medically as sexually transmitted infections (STIs) - cause no symptoms at all, especially during the early stages. You may feel completely healthy while unknowingly carrying an infection that can be passed on to a partner or lead to long-term health complications if left untreated.

As STD rates continue to rise worldwide, many people ask the same questions:

• Do I need an STD test?

• Which STD test is right for me?

• Is a swab enough, or do I need a blood test?

• How long should I wait after sex before getting tested?

• Can I rely on an at-home STD test?

  
  

The answer isn't always straightforward.

There is no single STD test that can detect every sexually transmitted disease. The most appropriate test depends on several factors, including the suspected infection, your sexual practices, possible symptoms, your individual risk factors, and how much time has passed since a potential exposure.

In this article, you'll learn:

• why are STD cases increasing

• when STD testing is recommended

• why many STDs cause no symptoms

Why Are STI Cases Increasing Across Europe?

According to recent data published by the ECDC, reported cases of bacterial sexually transmitted infections have increased significantly across Europe.

Since 2015:

• Gonorrhea cases have increased by more than 300%

• Syphilis cases have more than doubled

• Congenital syphilis, where the infection is passed from mother to baby during pregnancy, has also increased

  
  

Instead, several factors appear to be contributing simultaneously. More people are getting tested than ever before, meaning infections that once went undiagnosed are now being identified. Dating apps have also made meeting new sexual partners easier. At the same time, advances in HIV treatment and prevention have changed many people's perception of sexual risk.

The increase in reported STD cases is therefore likely the result of improved testing, better diagnostic tools, and changes in sexual behavior, not one single cause.

Can You Have an STI Without Symptoms?

Yes, and it's actually very common.

One of the biggest challenges in sexual medicine is that many sexually transmitted infections cause few or no symptoms.

As Dr. Johanna Janku explains:

"The absence of symptoms does not necessarily mean the absence of infection." 

Many bacterial and viral STDs remain completely asymptomatic for weeks, months, or even years. During this time, people often feel perfectly healthy while unknowingly transmitting the infection to others.

Another important concept is the diagnostic window period.

After a potential exposure, many infections cannot be detected immediately. Depending on the pathogen, it may take several days, or even several weeks, before laboratory tests can reliably identify the infection.

Testing too early may therefore produce a false-negative result, even if an infection is already present.

The location of the sample is just as important as the test itself.

Depending on your sexual practices, STDs may affect the:

• cervix

• vagina

• penis

• urethra

• throat

• rectum

  
  

Infections of the throat and rectum are particularly likely to cause no symptoms at all and may remain undetected unless these areas are specifically tested.

An accurate STD diagnosis depends on three things:

• the right test

• the right anatomical site

• the right timing

Feeling healthy doesn't always mean you're infection-free

Whether you should get tested depends on much more than symptoms alone.

STD testing may be recommended if:

• you've started a new sexual relationship

• you've had unprotected sex

• you've had multiple sexual partners

• you're experiencing symptoms such as unusual discharge, sores, pain, burning, or bleeding

• a sexual partner has been diagnosed with an STD

• you're pregnant or planning a pregnancy

• you've had a potential exposure and would like reassurance

  
  

How often you should get tested depends on your individual level of risk. For people with ongoing risk factors, routine STD screening every three to six months may be appropriate.

One of the most important messages Dr. Johanna Janku shares with her patients is this:

Having an STD has nothing to do with poor hygiene, your character, or your personal values.

Sexually transmitted infections are extremely common and can affect anyone who is sexually active.

Getting tested should be viewed as a routine part of preventive healthcare—just like a Pap smear, mammogram, colon cancer screening, or annual physical. There is absolutely no shame in taking care of your sexual health.

It's equally important to remember that not every genital symptom is caused by an STD.

Symptoms such as:

• itching

• burning

• unusual vaginal discharge

• irritation

• discomfort

may also result from changes in the vaginal microbiome, hormonal fluctuations, dermatologic conditions, or intimate skincare products.

A proper medical evaluation can help determine the underlying cause and ensure you receive the most appropriate treatment.

If you'd like to better understand how to support your vaginal health, read our article "Intimate Care: Between Media Headlines and Body Awareness."

Not Sure Whether You Should Get an STI test?

Whether you're experiencing symptoms, recently started a new relationship, had a potential exposure, or simply want peace of mind, a confidential consultation can help you make informed decisions about your sexual health.

At Oh Yes Baby Yes, Dr. Johanna Janku combines evidence-based medicine with compassionate, judgment-free care. As an FMH board-certified OB-GYN, specialist in sexual medicine, and certified sex therapist, she helps patients understand their individual risk, determine whether STD testing is recommended for them, and choose the most appropriate diagnostic approach.

Consultations are available in Zurich and online for patients worldwide.

Book a consultation at Oh Yes Baby Yes

confidential · evidence-based

Learn More About the Recent Rise in STIs

This article expands on topics discussed in a recent interview with Tamedia, Switzerland's largest private media company. The interview was published in Tages-Anzeiger and syndicated across several leading Swiss newspapers, including publications in Zurich, Bern, and Basel, reaching readers across Switzerland.

Read the original interview in German here.