Why does Rubella causes swollen lymph nodes?

Rubella, or German measles, causes swollen lymph nodes as part of the body's immune response to the viral infection. The virus triggers the activation of the immune system, leading to lymphadenopathy, which is the enlargement of lymph nodes. This occurs because lymph nodes are responsible for filtering pathogens and producing immune cells, causing them to swell when fighting off the virus. Swollen lymph nodes are a common symptom in many viral infections, including rubella.