Lymphoma is a type of cancer that affects the lymphatic system, which plays a vital role in the body's immune system. It occurs when lymphocytes, a type of white blood cell, undergo abnormal growth and form tumors. There are two main types: Hodgkin lymphoma and non-Hodgkin lymphoma. Common symptoms include swollen lymph nodes, fatigue, fever, and unexplained weight loss. The exact cause is often unknown, but factors like age, weakened immune system, and certain infections may contribute. Treatment options include chemotherapy, radiation therapy, immunotherapy, and stem cell transplantation. Early diagnosis and personalized treatment plans are crucial for managing lymphoma.