Leukemia can be classified into four main types: acute lymphoblastic leukemia (ALL), acute myeloid leukemia (AML), chronic lymphocytic leukemia (CLL), and chronic myeloid leukemia (CML). These types differ in terms of the affected cells and their rate of progression.

Common symptoms of leukemia include fatigue, frequent infections, unexplained weight loss, easy bruising or bleeding, swollen lymph nodes, bone pain, and pale skin. However, it's important to note that symptoms can vary depending on the type and stage of leukemia.

Diagnosis of leukemia typically involves a combination of blood tests, bone marrow biopsy, and imaging tests. Blood tests can identify abnormal levels of blood cells, while a bone marrow biopsy helps determine the type and extent of leukemia. Additional tests, such as genetic and molecular analyses, may also be conducted to guide treatment decisions.

Treatment options for leukemia depend on factors such as the type of leukemia, the patient's age and overall health, and the stage of the disease. Common treatment approaches include chemotherapy, radiation therapy, targeted therapy, immunotherapy, and stem cell transplantation. The specific treatment plan is determined by a multidisciplinary team of healthcare professionals.