Lymphoma is a type of cancer that affects the lymphatic system, which is part of the immune system. The lymphatic system includes the lymph nodes, spleen, thymus gland, and bone marrow. Lymphoma occurs when certain types of white blood cells, called lymphocytes, grow and multiply uncontrollably. These abnormal cells can form tumors and spread to other parts of the body.
There are two main types of lymphoma: Hodgkin's lymphoma and non-Hodgkin's lymphoma. Hodgkin's lymphoma is a rare form of lymphoma that is characterized by the presence of abnormal cells called Reed-Sternberg cells. Non-Hodgkin's lymphoma is a more common form of lymphoma and includes many subtypes.

Lymphoma is typically diagnosed through a combination of physical examination, blood tests, imaging studies, and biopsy of lymph node or other affected tissues.

The symptoms of lymphoma can vary depending on the type and stage of the disease, but may include enlarged lymph nodes, fever, night sweats, weight loss, fatigue, and itching.

Treatment for lymphoma may include chemotherapy, radiation therapy, targeted therapy, immunotherapy, and stem cell transplantation, depending on the type and stage of the disease. The treatment plan is typically tailored to the individual patient's needs and may involve a combination of different approaches. With proper treatment, many people with lymphoma can achieve long-term remission or even be cured.