Sexually transmitted diseases (STDs) are infections that are spread through sexual contact, such as vaginal, anal, and oral sex. STDs can be caused by a variety of bacteria, viruses, and parasites. 1 Some STDs, such as chlamydia and gonorrhea, may not have any symptoms 2 , but can still be passed on to sexual partners. STDs can be treated with medication 3 , but some can be dangerous if not treated. 2 STDs can also increase the risk of other health problems, such as infertility 4 and liver cancer. 5 It is important to use protection, such as a condom, during sex to reduce the risk of getting an STD. 6

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Summary STDs are sexually transmitted infections (STDs) that can be caused by a variety of bacteria, viruses, and bacteria. Planned Parenthood provides resources to help people learn more about STDs and how they are transmitted, as well as advice on how to have safer sex. STDs can be treated with medication, but some can be dangerous if not treated.
What Are STDs? | Sexually Transmitted Diseases ...

Summary If you have sex — oral, anal or vaginal intercourse and genital touching — you can get an STD , also called a sexually transmitted infection (STI). Regardless of your marital status or sexual orientation, you're vulnerable to STIs and STI symptoms.
Sexually transmitted disease (STD) symptoms - Mayo Clinic

Summary Sexually transmitted infections , also referred to as sexually transmitted diseases (STDs) and the older term venereal diseases, are infections that are spread by sexual activity, especially vaginal intercourse, anal sex, and oral sex. STIs often do not initially cause symptoms, which results in a risk of passing the infection on to others. Symptoms and signs of STIs may include vaginal discharge, penile discharge, ulcers on or around the genitals, and pelvic pain. Some STIs can cause infertility.
Sexually transmitted infection - Wikipedia

Summary Sexually transmitted diseases (STDs), or sexually transmitted infections (STIs), are infections that are passed from one person to another through sexual contact. The contact is usually vaginal, oral, or anal sex. But sometimes they can spread through other intimate physical contact.
Sexually Transmitted Diseases | STD | Venereal Disease | MedlinePlus

Sexually transmitted diseases (STDs), also known as sexually transmitted infections (STIs), are very common. Millions of new infections occur every year in the United States. STDs pass from one person…
CDC - STD Diseases & Related Conditions

Not an STD itself, pelvic inflammatory disease (PID) is a serious complication of untreated STDs, especially chlamydia and gonorrhea. It happens when bacteria spread to infect the uterus and...
STD Pictures: Herpes, Genital Warts, Gonorrhea, STD Symptoms, & Testing

STDs or STIs can have a range of signs and symptoms, including no symptoms. That's why they may go unnoticed until complications occur or a partner is diagnosed. Signs and…
Sexually transmitted diseases (STDs) - Symptoms and causes

Women older than 25 and at increased risk of STIs — such as having sex with a new partner or multiple partners. Men who have sex with men. People with…
STD testing: What's right for you? - Mayo Clinic