2. Swelling of the lymph nodes
Because lymphoma starts in the lymphatic system, lymph nodes throughout your body will be affected. In early stages, it usually manifests as painless swelling in your neck, armpits, or groin.
This happens when a type of white blood cell called a lymphocyte experiences a genetic mutation that causes it to multiply rapidly. It also allows these diseased cells to live longer than normal lymphocytes. Before long, too many diseased cells have crowded your lymph nodes and caused swelling.
You may notice this swelling before you experience any pain. But because many of the other symptoms of Hodgkin’s lymphoma are pretty non-specific, swollen lymph nodes are considered the hallmark symptom of the disease.