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 ...
Medically reviewed by Doru Paul, MD Key Takeaways Swollen lymph nodes are often a sign that your body is fighting an infection.Autoimmune diseases can also cause lymph nodes to swell.Certain ...