 In fact it is questionable whether any major school of philosophical thought denies outright the importance of happiness, at least on one of the plausible accounts of the matter. Doubts about its significance probably owe to several factors. Some skeptics, for example, focus on relatively weak conceptions of happiness, such as the idea that it is little more than the simple emotion of feeling happy—an idea that few hedonists or emotional state theorists would accept. Or, alternatively, assuming that a concern for happiness has only to do with positive states. Yet ‘happiness’ also serves as a blanket term for a domain of concern that involves both positive and negative states, namely the kinds of mental states involved in being happy or unhappy. Just as “health” care tends to focus mainly on ill health, so might happiness researchers choose to focus much of their effort on the study and alleviation of unhappiness—depression, suffering, anxiety, and other conditions whose importance is uncontroversial. The study of happiness need be no more concerned with smiles than with frowns.