what are the first signs and symptoms of leukemia?
['Fever or chills.', 'Persistent fatigue, weakness.', 'Frequent or severe infections.', 'Losing weight without trying.', 'Swollen lymph nodes, enlarged liver or spleen.', 'Easy bleeding or bruising.', 'Recurrent nosebleeds.', 'Tiny red spots in your skin (petechiae)']