Sexually transmitted infections
Sexually transmitted infections, or STIs, are infections passed through sexual contact. They can be caused by bacteria, viruses, or parasites. Different infections need different tests and care, and some may not cause obvious symptoms.
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BEYOND THE DEFINITION
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Understanding the basics can help you ask.
Sexually transmitted infections can be caused by bacteria, viruses, or parasites. Some cause symptoms, while others do not. Different infections need different testing and care; a symptom pattern alone cannot tell you which infection, if any, is present. [1]
Age, sexual history, symptoms, and the kinds of sexual contact can help determine which tests are appropriate. Samples may include blood, urine, or swabs from specific sites. A single test or sample does not necessarily check for every infection. [2]
ALSO WORTH KNOWING [1]
A lack of symptoms does not rule out an STI; appropriate testing and clinical advice are important. [1]
THE CLINICAL CONVERSATION
A healthcare professional can discuss your history without requiring you to guess which test to request. Mention possible exposures and any testing already completed, including home tests. Ask how results will be communicated and what follow-up you or partners may need if a result is positive. [2]
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Prepare for a care conversationTHREE QUESTIONS TO BRING
A FEW STRAIGHT ANSWERS
General information to help you prepare for a conversation about your own health.
Yes. Some STIs cause no noticeable symptoms and can still be passed to others. Testing and a clinical conversation are more reliable than symptoms alone. [1]
No. Different infections and exposure sites may need different samples, including blood or swabs. Ask the clinician what the selected tests cover and what they do not. [2]
CONNECT THE DOTS
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READ A LITTLE FURTHER
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References checked November 7, 2026. This content has not been clinically reviewed for Northguard.
