Experts don't exactly know what causes leukemia but things can increase the risk of having it like; being exposed to high radiation levels, having smoked, genetic disorders, exsperienses with benzene, and family history.
Fever or chills,
Losing weight without trying,
Enlarged spleen or liver,
Easily bruised,
Recurrent nosebleeds,
Petechiae,
Excessive sweating,
Bone pain.
Based on how old you are, your current health, what type of leukemia you have and wether its sprend, doctors will determine what method to try to cure you of leukeia.