T-Cell Acute Lymphoblastic Leukemia (T-ALL) is a type of cancer that affects the blood and bone marrow. It occurs when the body produces too many immature T-cells, a kind of white blood cell that helps fight infections. This overproduction can crowd out healthy blood cells, leading to symptoms like fatigue, fever, and easy bruising. T-ALL is more common in children and young adults but can occur at any age. Treatment typically involves chemotherapy, which aims to kill the cancerous cells and restore normal blood cell production. Early diagnosis and intervention are crucial for improving outcomes.