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Lymphadenitis is an infection in one or more lymph nodes. The lymph nodes help filter bacteria, viruses, and other unwanted material from the body.

Severe immune disorders may be obvious right after birth. Other immune disorders may cause only mild symptoms and may not be noticed until later in childhood or early adulthood.

When your immune system doesn't work the way it should, it is called an immune system disorder. Learn about the different types of immune system disorders.

Although lead poisoning is often associated with the paint of older homes, children may be exposed to lead if the soldering on water pipes is new. In fact, lead may be found in many parts of a home, including soil, food, or even the air.

While being a new mom brings lots of joy, it also brings stress--something a crying baby can make worse. Having a better understanding of why your baby cries can help you deal with this stress in a healthy way and help you avoid the most common form of child abuse: Shaken baby syndrome.

After PCI, you'll need to take blood thinners to prevent blood clots.

After percutaneous coronary intervention (PCI), it's important to follow your doctor's advice for exercise.

A subdural hematoma is a buildup of blood on the surface of the brain. The blood builds up in a space between the layers that surround your brain.

Ear barotrauma is a type of ear damage. Learn more about this condition, including causes, symptoms, diagnosis, and treatment.