Overview When a person has leukemia, the body produces too many blood cells of one type. These abnormal cells, usually white blood cells, look different from normal blood cells and do not function correctly. Deciding on Treatment Your treatment plan depends on the type of leukemia you have. Your health care team will provide information about your treatment options, including the benefits and side effects. Managing Side Effects Side effects are common during treatment for leukemia, but they vary from person to person. Your doctor will work to ease any side effects that you experience.