Phagocytosis is the process by which phagocytes ingest and digest foreign particles like bacteria. Phagocytes are immune cells that engulf pathogens and cellular debris. Hodgkin's lymphoma is a cancer of the lymphatic system that originates from lymphocytes in lymph nodes. Common symptoms include enlarged lymph nodes and fatigue. Treatment depends on disease stage and may include radiation, chemotherapy, or stem cell transplantation. Sarcoidosis is a disease of unknown cause that forms lesions in lymph nodes and organs like the lungs. It can improve spontaneously and treatments include corticosteroids.