Sexually Transmitted Infections

This fact sheet answers frequently asked questions about sexually transmitted infections.

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Sexually transmitted infections (STIs) are also known as sexually transmitted diseases (STDs). STIs are infections that spread from one person to another through sexual contact. If you are sexually active, you may be at risk for getting an STI such as chlamydia, gonorrhea, or syphilis.

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About STIs

Many people with STIs do not have symptoms but are still able to give the illness to others. Leaving an STI untreated can lead to serious health problems.

Your sexual health is important and staying safe from STIs is about knowing the facts. In Boston, three infections make up the majority of the STIs in the community. These are chlamydia, gonorrhea, and syphilis.

Facts about common STIs

Get better educated and protected against these common STIs by checking out the pages below. These pages include information about the signs and symptoms of STIs. They show when to get tested, and how to prevent these infections.