Duke University Medical Center researchers may have solved the mystery of why lymph nodes swell when the body fights infection. Their findings may redefine how the immune system functions, they said.

Lymph nodes are small (about 1-2 centimeters around or the size of a couple of AAA batteries side by side) oval or kidney-shaped structures that are a part of your immune system. They're part of your ...

The lymphatic system is a network of vessels, nodes, and ducts that pass through almost all bodily tissues. It allows the circulation of a fluid called lymph through the body in a similar way to blood ...

The submandibular lymph nodes sit between the submandibular salivary glands, which are underneath the tongue, and the mandible, or lower jawbone. Occasionally one or more of the lymph nodes may be ...