Why is mononucleosis called Glandular Fever?

Mononucleosis is often referred to as glandular fever because it typically causes swelling of the lymph nodes and other glands in the body, particularly the spleen and liver. The term "glandular" highlights this characteristic symptom of the illness, which is often accompanied by fever, sore throat, and fatigue. The condition is commonly caused by the Epstein-Barr virus (EBV), which infects B lymphocytes, leading to the activation and proliferation of these immune cells.