In many settings, it might seem easy to understand what someone means when they say they feel optimistic about things. Perhaps this is because they are only talking about a simple A or B scenario, and one of these options is clearly better than the other. But in the context of cancer care and experience, this kind of word seems to have a much more complex set of possible meanings. What is it to feel optimistic? Is it an absolute statement, and if not, how much room for doubt does it imply? For those dealing with cancer every day, either in a clinical setting or in personal experience of treatment, how important is this word? Could we even argue, using this word can be risky?