Concern yourself is a phrase that means to take an interest in or to worry about something. There are a number of synonyms that can be used in place of this phrase, depending on the context and the level of intensity of the emotion being expressed. Some possible synonyms include: Focus on, pay attention to, take heed of, take an interest in, care about, invest oneself in, worry oneself about, be troubled by, be anxious about, be bothered by, feel concern for, have a stake in, take to heart. Each of these synonyms conveys a slightly different emotional emphasis, from simple curiosity or mild interest to deep-seated worry or anxiety.