Vaginitis is a name for a group of vaginal infections. These include trichomoniasis, bacterial vaginosis (BV), and yeast infections. The only true STD (sexually transmitted disease) is trichomoniasis. But having any type of vaginitis may increase your risk of catching other STDs.

Syphilis spreads through any kind of sexual contact. That is vaginal sex, anal sex, or oral sex. This sexually transmitted disease (STD) or infection (STI) has 3 stages. It gets worse with each stage. Syphilis can be cured. But early treatment is important. Left alone, it can cause lasting damage, like blindness. Syphilis can even cause death.

In women, warning signs of STDs (sexually transmitted diseases) can be hard to notice. That's because the sex organs outside the body (the genitals) aren't easy to see. STDs also often affect the organs inside the body that let you get pregnant. Damage to these organs can sometimes cause sterility - meaning you won't be able to have kids. So learn about your body. Find out what's normal for you. And be sure to have any changes or symptoms checked out.

The only sure way to prevent STIs (sexually transmitted infections) is not having any kind of sex. But if you do decide to have sex, take steps to protect yourself. Here's what you need to know.

HPV (human papilloma virus) spreads through skin contact. Some types of HPV cause genital warts. Other types put females at higher risk of cancer of the cervix. HPV is very common in all people. And it can't be cured. But there are treatments to remove warts. Tests can also help spot warning signs of cervical cancer.

HIV weakens the parts of the body that fight off disease (the immune system). It spreads through body fluids passed during sex or through infected needles. When HIV starts to cause severe health problems, it's called AIDS. There's no cure for HIV or AIDS. But treatment called antiretroviral therapy can help you stay healthier longer.

Hepatitis is a disease that harms the liver through inflammation. Read on to learn more.

Here are answers to common questions about STIs.

Remember: Any kind of sex puts you at risk of sexually transmitted diseases (STDs). Look for signs of STDs on you and your partner. Get checked if you're not sure. And if you do have an STD, get treated! Tell your partner so he or she can get checked, too.

Chlamydia is an STD (sexually transmitted disease) that spreads when body fluids are passed during sex. Signs of chlamydia are often absent or hard to notice. So get checked if you think you might have it. Chlamydia can be cured.