Chronic Lymphocytic Leukemia (CLL) is a type of cancer that affects the blood and bone marrow. It primarily involves the overproduction of abnormal lymphocytes, a type of white blood cell that helps fight infections. CLL usually progresses slowly and may not cause symptoms in its early stages, making it often difficult to detect. As the disease advances, symptoms may include fatigue, swollen lymph nodes, and frequent infections. Diagnosis typically involves blood tests and bone marrow examinations. Treatment options for CLL can vary and may include chemotherapy, targeted therapy, or immunotherapy depending on the individual’s condition and overall health.