Blood cancer, also known as hematologic cancer, affects the production and function of blood cells. It includes types like leukemia, lymphoma, and myeloma. Symptoms can vary, but common signs include fatigue, unexplained weight loss, frequent infections, and easy bruising. The exact cause of blood cancer is often unclear, but genetic mutations, environmental factors, and family history can increase the risk. Treatment options include chemotherapy, radiation, stem cell transplants, and targeted therapies, depending on the type and stage of cancer. Early detection and prompt treatment are crucial for improving outcomes.