Is leukemia fatal?

It can be. There are different kinds of leukemia.The more aggressive acute leukemias are the most serious in that they grow quickly and can lead to death if not treated promptly. On the other hand, these have a chance of being cured depending on the type of leukemia, the age and performance status of the patient, etc. On the other hand chronic leukemias as a rule do not progress quickly but are rarely cured.