Acute Lymphoblastic Leukemia (ALL) is a type of cancer that affects the blood and bone marrow. It occurs when the body produces too many immature white blood cells, called lymphoblasts, which crowd out healthy cells. This can lead to symptoms like fatigue, frequent infections, and easy bruising. ALL is most common in children but can also occur in adults. Treatment for ALL often involves chemotherapy, which uses powerful drugs to kill cancer cells. In some cases, a stem cell transplant may be necessary to restore healthy blood cell production. Early diagnosis and treatment are crucial for improving the chances of recovery.