Hodgkin lymphoma is a type of cancer that affects the lymphatic system, which is part of the body's immune system. It occurs when certain white blood cells, called lymphocytes, grow uncontrollably. This can lead to swollen lymph nodes, fever, weight loss, and night sweats. Hodgkin lymphoma is often diagnosed in young adults and can be treated effectively with chemotherapy and radiation. The exact cause of Hodgkin lymphoma is not known, but it is believed to involve a combination of genetic and environmental factors. Researchers have identified a specific type of cell, known as the Reed-Sternberg cell, that is characteristic of this disease. Early detection and treatment are crucial for improving outcomes.