Some sexually transmitted infections have no symptoms – here’s what you need to know

Published: March 16, 2022 | Updated: August 21, 2024

Sexually transmitted infections (STI) are bacteria, viruses or parasites that are spread usually through bodily fluids such as blood or semen. How can you tell if you have an STI? Some STIs don’t have symptoms, but many do.

 Symptoms that might indicate an STI include:

• Sores, bumps or itching on the genitals or in the oral or rectal area
• Pain or burning during urination
• Discharge from the penis
• Unusual vaginal discharge or bleeding
• Pain during sex
• Sore, swollen lymph nodes, particularly in the groin but sometimes more widespread
• Lower abdominal pain
• Rash over the trunk, hands or feet

Depending on the infection, symptoms can appear a few days after exposure up to a few years.

What to do if you think you have an STI

If you develop symptoms listed above or if a sexual partner has tested positive for an STI, seek medical care immediately.

You should see a doctor regularly for an STI checkup after you become sexually active, and before you start having sex with a new partner.