In-depth

Causes

Diphtheria

Diphtheria — Comprehensive overview covers symptoms of this infection that's preventable with a vaccine.

Genital herpes

Genital herpes is a highly contagious sexually transmitted infection. The sores associated with the disease go through cycles of outbreaks and healing.

Rubella

Rubella, a contagious viral infection, is most dangerous to pregnant women. Rubella can be prevented with the combined measles-mumps-rubella vaccine.

Sexually transmitted diseases

Sexually transmitted diseases — Comprehensive overview covers symptoms, diagnosis and treatment of STDs.

Strep throat

Strep throat is a bacterial throat infection. It typically causes a very sore throat and is treated with antibiotics.

Swimmer's ear

Swimmer's ear, an infection in the outer ear, is usually caused by bacteria and is more common in ears exposed to water for long periods.

Toxoplasmosis

Toxoplasmosis is an infection caused by a parasite. It doesn't make most people ill, but infants and people with HIV/AIDS are at risk of complications.

Complications

Tooth abscess

Tooth abscess — Comprehensive overview covers symptoms, causes, treatment of this painful tooth condition.

Risk factors

HIV/AIDS

More than 39 million people are living with HIV — the virus that causes AIDS. Millions more are lipkely to become infected in the next decade. More than 39 million people are living with HIV — the virus that causes AIDS. Millions more are likely to become infected in the next decade.

Hodgkin's lymphoma

Hodgkin's lymphoma (Hodgkin's disease) is cancer of the lymphatic system. Many early symptoms of this cancer resemble those of the flu.

Mononucleosis

Mononucleosis — also called kissing disease because it can be spread by kissing — causes fatigue, fever and swollen lymph glands.

Syphilis

Syphilis, a sexually transmitted infection, first appears as painless sores on your genitals, rectum or mouth. Early diagnosis is important.

Symptoms

Runny nose

Runny nose: What's causing your sniffles?

Tests and diagnosis

Chest X-rays

Even with today's high-tech medical devices, the basic chest X-ray remains an important tool in diagnosing various conditions. Here's a look at how it works.

Complete blood count

A complete blood count can be used to evaluate your overall health, detect a wide range of disorders, or monitor a medical condition or treatment.

CT scan

A CT scan is an imaging test that uses X-rays to produce detailed images of the inside of your body.

Needle biopsy

Find out what to expect during a needle biopsy.

Jan. 02, 2014