Lymphoid hyperplasia is a rapid increase in the number of normal cells (called lymphocytes) that are contained in lymph nodes.
These cells increase in number to help lymph nodes prevent bacteria, viruses, and other types of germs from spreading through the body.
Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.