Women may be surprised to learn heart disease is the biggest threat to their health--even more so than breast cancer. And the same factors that put women at risk of a heart attack also increase their chances of stroke and other health problems. If your heart's in trouble, your body may send you warning signs. It's up to you to notice these and talk to your healthcare provider about them.

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

Syphilis is an STI that spreads through any kind of sexual contact. Early treatment is important. Left alone, it can cause lasting damage, like blindness and death.

In women, warning signs of STDs (sexually transmitted diseases) can be hard to notice. So learn about your body. Find out what's normal for you. And be sure to have any changes or symptoms checked out.

Males may have fewer symptoms of STIs than females. Read on to learn what those symptoms are.

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.

Herpes is a sexually transmitted disease (STD) or sexually transmitted infection (STI). It causes painful outbreaks of blisters and sores. It spreads through contact with an infected area—usually a sore on the genitals, rectum, or mouth.

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