&NA;There is a need to understand and explain why quality of life (QOL) is experienced and viewed differently by those with acute and chronic leukemia. A total of 23 adults with either acute or chronic leukemia were interviewed about their experience of QOL. Adults with acute leukemia described QOL as a positive attitude to life, whereas those with chronic leukemia described QOL as life satisfaction. In order to elucidate why there are differences in their experience of QOL, a qualitative text analysis was used. The narrated interviews, tape-recorded and transcribed verbatim, were interpreted based on the following three questions: Why are there differences in these individuals' description of QOL? What are they talking about? Which phenomenon are they describing? The findings were interpreted, "a feeling of uncertainty," which made the difference to their experience of QOL. This uncertainty was expressed in different forms and could be seen in different degrees. Uncertainty is an important factor affecting the QOL of these adults. Nurses who work with these patients have a major role to play in minimizing uncertainty by offering coping skills to deal with feelings and improving QOL, since QOL is one of the outcomes of nursing care.